Vehicle Size & Weight
Aerodynamic Device Compliance with 23 CFR 658.16(b) (4)
New 10/15/08 Aerodynamic Device Compliance with 23 CFR 658.16(b) (4) 'Exclusions from Length and Width Determinations' letter of acceptance.
Federal interest in preserving highways goes back to the enactment of the Federal-Aid Highway Act of 1956, which authorized the Interstate and Defense Highway System. To preserve our Nation's infrastructure and to keep trucks and buses moving efficiently, states must ensure that commercial motor vehicles comply with federal size and weight standards. FHWA is responsible for certifying state compliance with Federal standards. This site provides a ready source of information on Federal standards and guidelines, state enforcement activities, reporting requirements, and contacts.
Vehicle Size and Weight Program Overview
Questions and Answers about Vehicle Size and Weight
Vehicle Size & Weight Challenges, Concerns and Future Directions [HTML, PDF - 217KB]
Federal Size and Weight Regulations
- 23 CFR 658
- 23 CFR 657
- Federal Size Regulations for Commercial Motor Vehicles [HTML, PDF 1.1MB]
- Bridge Formula Weights [HTML, PDF 1.5MB]
- Bridge Formula Weights Calculator
Federal Notices and Rulemakings on Vehicle Size and Weight
- Section 1305 Truck Parking Facilities
- Commercial Vehicle Width Exclusive Devices (includes Supplementary Notice of Proposed Rulemaking and Final Rulemaking on Recreational Vehicles)
- Designation of Dromedary Equipped Truck-Tractor-Semitrailers as Specialized Equipment
Publications
- Commercial Motor Vehicle Size and Weight Enforcement in Europe
- Freight News: Commercial Vehicle Travel Time & Delay at U.S. Border Crossings [HTML, PDF 111KB]
- Truck Characteristics Analysis Study
- Truck Size and Weight Studies by the FHWA Office of Policy
- Law Enforcement Escort Best Practices Guidelines (Publication Number: FHWA-HOP-04-027) [HTML, PDF 3.4MB]
- Pilot Car Escort Best Practices Guidelines (Publication Number: FHWA-HOP-04-026) [HTML, PDF 2.5MB]
- TRB Special Report 267, Regulation of Weights, Lengths, and Widths of Commercial Motor Vehicles
- United States Department of Transportation Comprehensive Truck Size and Weight Study
State Reports
Other Related Sites
Staff Contacts
Michael Onder
202-366-2639
Michael.Onder@dot.gov
John Nicholas
202-366-2317
John.Nicholas@dot.gov
Tom Kearney
518-431-4125 Extension 218
Tom.Kearney@dot.gov
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