Conservation and Stabilization of the Plaster and Decorative Paint at the President’s Room Ceiling, United States Capitol Building

Amendment / Modification

This amendment (01) to solicitation AOCSSB26R0023 makes the following changes:

• Provides responses to RFIs as a new attachment, Section J, J.15.

• Updates the Statement of Work (SOW) in Section J, J.1, by adding sections 4.2 and 4.13.5.

• Section J, Attachment J.1 (Statement of Work) has been updated.

• A new attachment, Section J, J.15 (RFI Log), has been added.

• All other requirements remain unchanged.

• The proposal due date remains the same.

Statement of Work (SOW)

This Statement of Work outlines the requirements for the conservation and stabilization of the plaster and decorative paint on the ceiling of the President's Room (S-216) in the United States Capitol Building.

The project involves engaging an Architectural Conservation (AC) Firm to provide design services for ceiling plaster restoration/repair and implement a treatment plan. The scope includes:

• Reviewing previous condition assessments and investigations.

• Examining the plaster ceiling and painted/gilded/fresco finishes, updating condition assessments as needed.

• Conducting paint sampling and exposures.

• Identifying materials and methods for plaster consolidation/stabilization and protection of finishes.

• Preparing mock-ups, testing, and evaluating proposed treatment materials and methods.

• Developing treatment and work plans for stabilization and conservation.

• Implementing cleaning, localized consolidation of flaking finishes, and plaster treatment.

• Preparing a final completion report documenting all phases, treatments, and recommendations.

• Base contract period of performance: 180 calendar days from award.

• Option 1 period of performance: 480 calendar days, completion by June 30, 2028.

• Work will primarily be performed at the AC's facilities, with meetings and site visits at the U.S. Capitol Building.

• The contractor must provide key personnel with extensive experience in plaster and paint conservation, including Senior Conservators, Conservators, and a Conservation Scientist.

• Adherence to all applicable local, state, and federal regulations, including OSHA standards for hazardous materials (asbestos, lead, silica).

• Development and maintenance of a Quality Control Program.

• Compliance with security requirements for handling sensitive information and personnel verification.

• The contractor must provide a Safety Work Plan and comply with AOC's safety and code compliance requirements.

• Government-furnished property includes access to water and electricity, scaffolding, furniture and chandelier removal (via separate contract), and lifts for testing/analysis. AOC will provide protection for walls and floors before scaffolding installation.

Questions & Answers / Clarifications

This document provides responses to Requests for Information (RFIs) and clarifications regarding the President's Room Ceiling Restoration opportunity (Solicitation No. AOCSSB26R0023-S-216).

• Access to Data: Photogrammetry, 3-D laser scanning files, and sound library data from the ICR team are available as part of the ICR Final Report (Pages 13, 43, 20, and 237).
• Intact Plaster Fragments: Fragments from previous studies and those discovered during chandelier removal are available for on-site review at the AOC Curators office.
• Paint/Plaster Surveys: Any required updates to these surveys should be submitted as a report with photographs and findings, per SOW Section 1.4.1.
• Environmental Monitoring: Data will be provided upon contract award. Vibration monitoring is not currently implemented.
• Overpaint Removal: Overpaint removal and visual reintegration are not part of the current scope of work.
• Paint Delamination: Delamination at the trompe l'oeil borders is not part of the current scope of work.
• Taxes: The contract is NOT exempt from sales and use taxes; all applicable taxes must be included in the contract price.
• Labor Laws: The Davis Bacon Act is NOT applicable as the work is classified as professional services, not construction. The McNamara-O'Hara Service Contract Act (SCA) is also NOT applicable as all personnel are considered professional services (Reference attachment J.2, pg 1, para. 6).
• Bonds: Offerors are NOT required to provide bid bonds, performance bonds, or payment bonds.

This document clarifies scope, data availability, and submission requirements, and explicitly states that bid bonds and performance/payment bonds are not required. It also confirms the applicability of certain labor laws and tax requirements.

Statement of Work (SOW) / Performance Work Statement (PWS)

To conserve and stabilize the plaster ceiling and decorative paint finishes in the President's Room (S-216) of the United States Capitol Building.

The Architect of the Capitol (AOC) seeks an Architectural Conservation (AC) Firm to provide design services for plaster restoration/repair and implement a treatment plan. The scope includes:

• Reviewing existing documentation and condition assessments.

• Surveying the current condition of the plaster ceiling and decorative finishes.

• Providing additional paint sampling and exposures as needed.

• Identifying materials and methods for plaster consolidation/stabilization.

• Proposing materials and methods for protecting painted/gilded/fresco finishes and shoring plaster sections.

• Preparing mock-ups, testing, and evaluating proposed treatment materials and methods.

• Developing treatment and work plans for stabilization and conservation.

• Executing the stabilization of the plaster ceiling and conservation of decorative paint finishes.

• Cleaning, localized consolidation of flaking finishes, paint sampling, and temporary protection.

• In-situ testing and assessment of treatment effectiveness.

• Preparing an illustrated written completion report.

• Base contract: 180 calendar days from award.

• Option 1 (Implementation): 480 calendar days, completion by June 30, 2028.

• Work will primarily occur on AOC premises (Capitol Hill), with some work potentially at the AC's facilities.

• The contractor must identify and comply with all applicable federal, state, and local regulations, including those for hazardous materials and waste (asbestos, lead, crystalline silica).

• Personnel must have appropriate federal and state training and accreditation.

• A Safety Work Plan must be submitted and accepted.

• A Quality Control Program must be developed and maintained.

• Key personnel with specific years of experience in plaster and paint conservation are required.

• Government Furnished Property (GFP) will include access to water, electricity, and potentially scaffolding and lifts.

Statement of Work (SOW) / Performance Work Statement (PWS)

This document outlines specific requirements for conservators handling hazardous chemicals, hazardous waste, and PCB wastes during conservation work in the Capitol Building (CB) and Capitol Visitor Center (CVC).

• Contractors producing hazardous waste must determine if wastes are hazardous or regulated as PCB wastes.

• For waste quantities less than 55 gallons, the CB jurisdiction will provide storage at the CB Hazardous Waste Accumulation Site and arrange disposal. Contractors are responsible for waste collection and placement into the site.

• Contractors must test for PCBs if the work area contains materials not yet tested.

• If disturbing lead paint over two square feet, a lead work plan compliant with "Lead Work Requirements for Conservation and Restoration in the U.S. Capitol" must be submitted, and a meeting with CB safety staff is required.

• All hazardous and PCB wastes must be placed in UN approved containers, properly managed in the CB Hazardous Waste Accumulation Area, and labeled with appropriate preprinted labels, accumulation start dates, and hazard identification.

• Different types of waste must not be mixed.

• Hazardous waste can only be accumulated on-site for 90 days.

• Non-hazardous waste must be collected and disposed of daily using the CVC trash dumpster.

• Materials known to be hazardous or flammable may be stored in the Capitol but must be removed at the end of the shift, with storage arranged through the CB Hazardous Waste Site Accumulation Manager, COR, or CB Safety Manager.

• Any hazardous chemicals not in their original container must be clearly labeled according to OSHA standards.

• No materials or waste are to be deposited in drains.

• At the start of each work week, contractors must provide a list of specific hazardous chemicals to be used, along with their Safety Data Sheets (SDS). SDS requirements for handling, storage, and disposal must be followed, and a binder of SDS must be available on-site.

• Work is to be performed in the Capitol Building (CB) and Capitol Visitor Center (CVC).

• Hazardous waste accumulation on-site is limited to 90 days.

• Compliance with federal, state, and local environmental and safety regulations (including 29 CFR 1910.120, 1910 Subpart Z, 1910.1200, 40 CFR 260-299, 40 CFR 761, and 20 DCMR Chapters 40-54) is mandatory.

• Contractors must coordinate with specific AOC personnel for waste storage, disposal, and safety matters.

• The Contracting Officer's Representative (COR) is responsible for enforcing contract requirements.

Solicitation / RFP / RFQ

This document is a solicitation (AOCSSB26R0023) issued by the Architect of the Capitol for supplies or services. The specific nature of the procurement is detailed in Section B (Supplies or Services and Prices/Costs) and Section C (Description/Specifications/Work Statement), which are not fully provided in the initial pages.

Section B outlines specific line items for "Base: Plaster and decorative paint conservation/stabilization Treatment plan" and "Option: Plaster and decorative paint conservation/stabilization Implementation," as well as "Option: Engineering services for Plaster and decorative paint conservation/stabilization Implementation." These indicate a need for conservation and stabilization services related to plaster and decorative paint.

• The contract type is Firm-Fixed Price.

• The initial period of performance for the base item is from 08/17/2026 to 02/16/2027.

• There are options for additional services with periods of performance extending into 2028.

• The contract term includes an option for an additional sixteen (16) month period, making the total potential term up to 22 months.

• Offers are due by 02:00 ET on 04/20/2026.

• Proposals must be submitted to the address specified in Item 8.

• Section M outlines the evaluation factors for award, stating that the contract will be awarded to the responsible offeror whose offer is most advantageous to the Government, considering cost or price and other factors.

No specific set-aside or eligibility requirements are immediately apparent from the provided pages, but standard clauses regarding equal opportunity and certifications are included.

• The solicitation incorporates numerous FAR clauses by reference.
• Specific instructions for proposal submission, including packaging and transmission, are detailed in Section L.
• Offerors are urged to inspect the site (Section L, 52.237-1).

Solicitation / RFP / RFQ

This Request for Proposal (RFP) # AOCSSB26R0023, issued by the Architect of the Capitol (AOC), is for the Conservation and Stabilization of the Plaster and Decorative Paint at the President's Room Ceiling, S-216, United States Capitol Building. The AOC intends to award one contract to the responsible Offeror providing the best overall value.

• The core service involves the conservation and stabilization of plaster and decorative paint.

• The approach must address the scope of work as detailed in the Statement of Work (SOW).

• Offerors must provide a sample conservation report with photo documentation.

• The contract will have a 6-month base period from the date of award, with a 16-month option period.

• The North American Industry Classification System (NAICS) code is 541990.

• The McNamara-O'Hara Service Contract Act (SCA) is not applicable.

• Proposals are due by Monday, April 20, 2026, at 2:00 PM EDT.

• Questions are due by Wednesday, April 8, 2026, at 4:00 PM EDT.

• A non-mandatory site visit will be held on Tuesday, April 7, 2026, at 1:00 PM EDT. Registration is required by Wednesday, April 1st.

• Proposals will be evaluated using a Tradeoff approach, considering technical factors (Corporate Experience, Technical Approach, Key Personnel, Past Performance) as significantly more important than Price.

• Proposals must be submitted in two volumes: Volume I (Technical) and Volume II (Price).

• This acquisition is not a set-aside and is open to all businesses registered in SAM, regardless of size.

• The AOC is not subject to the Federal Acquisition Regulation (FAR) but follows its own Contracting Manual.

• Offerors must adhere to specific formatting and submission requirements outlined in Section L.

Form / Attachment / Pricing Sheet

This document is Attachment J.3, a Pricing Proposal spreadsheet, for the "Conservation and Stabilization of the Plaster and Decorative Paint at the President’s Room Ceiling, S-216 United States Capitol Building" opportunity. Bidders must use this form to submit their pricing.

• CLIN 0001 (Treatment Plan): Requires a Firm Fixed Price (FFP) for the proposed treatment plan, mockups, and final treatment plan.
• CLIN 0002 (Implementation of Treatment Plan): This is an Unpriced Option, to be negotiated upon acceptance of the Treatment Plan. Pricing will be based on accepted CLIN 0004 Time and Material rates.
• CLIN 0003 (Engineering Services): Requires an FFP for structural engineering services for temporary shoring design, if needed.
• CLIN 0004 (Ad Hoc Services): Requires fully burdened hourly rates for specified labor categories (Senior plaster conservator, Senior painting conservator, Conservator, Conservation Technician, Structural Engineer). Offerors must also propose percentages for Overhead and Profit. These rates will be the basis for any Ad Hoc work and negotiations for CLIN 0002.
• Travel Costs: Allowable per SOW section 5.8 if outside a 50-mile radius. Costs for transportation, lodging, meals, and incidental expenses should be based on mileage rates and per diem. Travel costs for CLIN 0001 are part of the FFP and not subject to adjustment.
• Instructions: All yellow cells in the spreadsheet must be completed.

This document is critical for bidders to understand the contract's CLIN structure, pricing requirements, and how to submit their financial proposal. It details the specific labor categories and cost components that need to be priced, including the distinction between Firm Fixed Price and Time & Material CLINs, and the unpriced nature of CLIN 0002.

Other / Unclassified

This document comprises multiple reports detailing a comprehensive analysis of the President's Room ceiling in the U.S. Capitol Building. The analysis includes archival research, laser scanning, digital photogrammetry, finishes condition assessment, and various evaluations of the plaster ceiling and decorative elements. Key findings highlight significant plaster detachment from the substrate and issues with fresco and decorative finishes, such as overpaint, flaking, and efflorescence.

Specific reports included are:

• Integrated Conservation Resources, Inc. (ICR) President's Room Ceiling Analysis - Phase 1-4 Report: Details archival research, laser scanning, photogrammetry, finishes assessment, and various testing methods (Sounding, Vibrometry, S.P.R., Ultrasonic Pulse Echo, Drilling Resistance, plaster sample analysis). It notes plaster detachment and issues with decorative elements.
• Aaslestad Preservation Consulting LLC Findings Report: Focuses on the architectural form of the ceiling, incorporating ICR's data on cracks, sounding, and vibrometry. It includes analysis of 3D scans, pointcloud data, and references a paint assessment report.
• Gianfranco Pocobene Studio Paint Assessment Report: Provides scientific analysis of paint samples from frescos and decorative borders, detailing composition, stratigraphy, condition, and efflorescence.
• Highbridge Materials Consulting, Inc. Plaster Analysis Report: Presents laboratory analysis of plaster samples, including petrographic and chemical examination to determine constituents, proportions, and condition.

This collection of reports offers critical, detailed technical information for any bidder involved in the preservation, restoration, or maintenance of this historical architectural feature. It outlines the current structural and material condition of the ceiling, identifies specific areas of concern (plaster detachment, cracks, paint degradation, efflorescence), and details the methodologies used for assessment. Understanding these findings is essential for bidders to accurately assess the scope of potential work, anticipate challenges, and develop informed proposals for future conservation or repair projects on this significant site.

Other / Unclassified

This document is a memorandum from Whitman, Requardt & Associates, LLP (WRA) to the AOC Project Manager, providing comments on the PHASE 1-3 DRAFT REPORT concerning the President's Room Ceiling Analysis, submitted by Integrated Conservation Resources, Inc. (ICR). The memorandum details both overall and specific comments and suggestions aimed at improving the ICR report for the project record.

While this document is a set of internal comments and not a solicitation or SOW, it highlights areas where the original ICR report may be lacking clarity or detail. Bidders interested in opportunities related to historical building analysis, structural integrity assessments, or conservation work might find value in understanding the types of detailed feedback and scrutiny applied to such reports. The comments point to a need for clearer explanations of testing methodologies (e.g., NDT methods, laser scanning density), more concise executive summaries, better definitions of terms (e.g., "deflected" vs. "detached" plaster), and more precise data presentation (e.g., clarifying figures, providing units, ensuring consistency between text and visuals). It also indicates specific areas where further investigation or clarification is needed regarding water infiltration, plaster conditions, and monitoring recommendations. This level of detail suggests the importance of thoroughness and precision in technical reporting for government contracts in this domain.

Other / Unclassified

This document is a memo from Integrated Conservation Resources, Inc. (ICR) to the Architect of the Capitol, detailing the findings of a Surface Penetrating Radar (SPR) assessment conducted in the Press Room, above the President's Room. This assessment was part of a larger effort to understand the root causes of plaster detachment and compromised plaster in the President's Room ceiling.

The SPR testing, performed by Atkinson-Noland and Associates (ANA), aimed to analyze the cross-section of the brick vault above the President's Room ceiling and identify any anomalies. The testing identified utility lines, mapped the vault's cross-section, and detected several anomalies within the vault, including a steel ring around the perimeter and isolated locations of potential internal voiding at the collar joint.

While this document is not a solicitation or SOW, it provides critical technical information about the existing conditions of the President's Room ceiling structure. The findings, such as the identification of utility lines, the vault's construction (8-inch thick, two-wythe brick arch system), and potential voiding, are relevant for any bidder considering work on or around this area. The information helps in understanding the complexities of the existing structure and potential challenges for future work. The document also references a previous Phase 1-4 report and indicates that the SPR findings help inform decisions on the placement of probes and monitoring systems.

Statement of Work (SOW) / Performance Work Statement (PWS)

This document outlines the safety requirements for lead work during conservation and restoration projects in the U.S. Capitol, specifically focusing on the disturbance or removal of lead or lead-based paint.

The Conservator shall:

• Submit a detailed lead work plan for approval, adhering to 29 CFR 1926.62.
• Explain how work will comply with federal, state, and local regulations for handling and storing lead paint and waste.
• Schedule and conduct testing and monitoring for lead, including pre- and post-wipe sampling. Clean-up of lead dust must meet pre-test levels; sweeping or compressed air is prohibited for cleaning lead dust.
• Detail measures to protect building occupants from lead contamination.
• Describe the collection and storage of all potential lead-contaminated waste (paint chips, debris, containers, clothing, etc.).
• Outline the use of Personal Protective Equipment (PPE) to contain lead contamination.
• Provide training certificates for all workers involved in lead-based paint removal, meeting OSHA and EPA standards.
• Designate a Competent Person to supervise the project onsite.
• Submit Safety Data Sheets (SDS's) for all products used, prioritizing the least toxic suitable product.
• Notify specific Capitol Building contacts 15 business days prior to project start.
• Comply with the District of Columbia's lead law 11-221.

Not explicitly stated, but applies to conservation and restoration projects in the U.S. Capitol.

• Adherence to 29 CFR 1926.62.
• Compliance with federal, state, and local laws regarding lead.
• OSHA and EPA lead-safe practices training.
• Use of appropriate PPE.
• District of Columbia lead law compliance.

Form / Attachment / Pricing Sheet

This document is a Past Performance Questionnaire (PPQ) being submitted by a company to a previous client/customer. The purpose is to gather feedback on the company's performance under a past contract, which will be used by the Architect of the Capitol (AOC) for source selection. The feedback is considered Source Selection Sensitive.

• Recipient: The company/individual who previously contracted the services of the company being evaluated.
• Company/Individual Requesting Information: The entity whose past performance is being evaluated.
• Past Project Title: The specific project for which performance is being assessed.
• Point of Contact (POC) Information: Details for verification purposes (Name, Phone, Fax, Email, Address, Position).
• Ratings: A scale of "O" (Outstanding), "S" (Satisfactory), "M" (Marginal), "U" (Unsatisfactory) to evaluate performance in various areas.
• Performance Areas: Specific questions cover meeting schedules, problem resolution, quality control, work quality, pricing, labor standards compliance, safety compliance, issuance of notices (cure, show cause, etc.), willingness to re-award, customer satisfaction, relationship with the owner's team, on-site management, corporate management, and modifications filed.
• Overall Rating and Additional Comments: Space for a final assessment and any further remarks.

Bidders should be aware that this questionnaire is part of the evaluation process for the opportunity. While bidders do not complete this form themselves, understanding its content helps them anticipate the type of feedback the government will be soliciting from their past clients. The questionnaire is to be completed and returned directly to the AOC by the POCs listed (Troy Dorsey and Lily Najera) by April 20, 2026, at 2:00 PM ET.

Form / Attachment / Pricing Sheet

This document is the United States Capitol Police (USCP) Request for Check of Criminal History Records form (CP-491, 05/18). It is used by authorized requesters to initiate a criminal history records check for an applicant or employee.

• Applicant Information: Sections 1-17 require the applicant's personal details including name, address, employer, date of birth, contact information, physical characteristics, and a signed release of information.
• Authorized Requestor Information: Sections 18-24 require information about the individual or agency requesting the check, including name, agency, position, and contact details.
• Identification Section: Sections 25-28 are for the USCP to record details of the check conducted, including the date, FBI number, and the document used to establish the individual's identity.
• Instructions: The form provides instructions for both the applicant and the authorized requestor, including the requirement for a valid government-issued photo identification when submitting the form in person.

This form is likely an attachment or required document for an opportunity that involves background checks or security clearances. Bidders may need to understand its purpose and how it will be used in the process of onboarding personnel or fulfilling contract requirements that necessitate such checks.

Form / Attachment / Pricing Sheet

This document is the U.S. Department of Homeland Security's Employment Eligibility Verification form (Form I-9). It is used to verify the identity and employment authorization of individuals hired in the United States. Employers are required to complete Section 2 of this form for every new hire.

• Section 1: Employee Information and Attestation: Completed by the employee to attest to their citizenship or immigration status and provide personal information.
• Section 2: Employer or Authorized Representative Review and Verification: Completed by the employer after physically examining acceptable documents presented by the employee to establish identity and employment authorization. This section requires the employer to record details of the documents presented.
• Section 3: Reverification and Rehires: Used for rehires or when an employee's employment authorization has expired.
• Lists of Acceptable Documents: Provided on page 3, detailing documents that establish identity and employment authorization (List A), identity only (List B), and employment authorization only (List C).

While this is a standard government form and not directly part of a solicitation's technical requirements, bidders may encounter this form if they are a prime contractor or subcontractor needing to verify the employment eligibility of their personnel working on a government contract. Understanding the acceptable documents for Form I-9 is crucial for compliance with employment laws.

Form / Attachment / Pricing Sheet

This document is an ACORD Certificate of Liability Insurance (Form 25). It serves as proof of insurance coverage for the named insured, "Name of Contractor," and lists the types of insurance, policy numbers, effective and expiration dates, and coverage limits. It is intended to provide information about the insurance policies in effect and does not alter the coverage provided by those policies.

• Insured: Name of Contractor
• Certificate Holder: Architect of the Capitol, U.S. Capitol Building, Washington, D.C.
• Coverages: General Liability, Automobile Liability, Umbrella Liability, and Workers' Compensation and Employers' Liability.
• Policy Details: Includes policy numbers, effective and expiration dates, and specific limits for each coverage type.
• Additional Insured Clause: Notes that "The United States of America, acting by and through the Architect of the Capitol shall be included as an additional insured with respect to operations under this contract."

This certificate is likely required as part of the bid package or as a condition of contract award. Bidders must ensure their insurance policies meet or exceed the requirements outlined in the solicitation and that the certificate holder (Architect of the Capitol) is correctly listed. The "Additional Insured" clause is particularly important for bidders to confirm is included in their coverage.

Form / Attachment / Pricing Sheet

This document outlines the "Equal Employment Opportunity is THE LAW" notice, which details federal protections against discrimination in employment. It serves to inform applicants and employees of their rights under various federal laws.

• Private Employers, State and Local Governments, Educational Institutions, Employment Agencies and Labor Organizations: Protected under Federal law from discrimination based on Race, Color, Religion, Sex, National Origin, Disability, Age, and Genetic Information.
• Federal Contracts or Subcontracts: Employers holding these are also protected under Executive Order 11246, Section 503 of the Rehabilitation Act, and the Vietnam Era Veterans' Readjustment Assistance Act.
• Programs or Activities Receiving Federal Financial Assistance: Protected under Title VI of the Civil Rights Act, Title IX of the Education Amendments, and Section 504 of the Rehabilitation Act.
• Retaliation: Prohibited against individuals who file discrimination charges or participate in proceedings.
• How to Report Discrimination: Provides contact information for the U.S. Equal Employment Opportunity Commission (EEOC) and the Office of Federal Contract Compliance Programs (OFCCP).

This document is crucial for bidders to understand the equal employment opportunity requirements and protections that apply to federal contractors and recipients of federal financial assistance. It highlights the legal framework governing fair employment practices, which may be a consideration in proposal preparation or contract compliance.

Other / Unclassified

This document is a reference guide for vehicle delivery procedures to the United States Capitol Police, effective May 1, 2008. It outlines hours of operation for the Off-site Delivery Center (OSDC), delivery access points for various Capitol buildings (Capitol/CVC, House Office Buildings, Senate Office Buildings, Supreme Court/Library of Congress), and procedures for exceptions and after-hours deliveries.

This document is relevant to potential bidders who may need to make deliveries to Capitol facilities as part of a contract. It details:

• Delivery Inspection: All vehicles must be inspected at the OSDC (4700 Shepherd Parkway) before making deliveries on Capitol Grounds.
• Road Restrictions: Vehicles over 1 1/4 ton capacity or with more than two axles are restricted.
• Delivery Access Points & Hours: Specific entry points and operating hours are provided for the Capitol/CVC, House Office Buildings, and Senate Office Buildings.
• After-Hours/Exception Procedures: Requirements for prior notification and specific inspection points (3rd & Maryland SW) are outlined for deliveries outside of normal hours or to specific locations like the Botanic Garden, LOC, and Supreme Court.
• Prohibited Vehicles: Defines vehicles that are prohibited based on size and axle count.