Regulations requiring rear impact guards have been in the FMCSRs since 1952 – but they're not on the list of items in the required annual commercial motor vehicle inspection. - Photo: Jim Park

Regulations requiring rear impact guards have been in the FMCSRs since 1952 – but they’re not on the list of items in the required annual commercial motor vehicle inspection.

Photo: Jim Park


The Federal Motor Carrier Safety Administration has proposed to include the rear impact (underride) guard on the list of items to be examined during the required annual inspection for each commercial motor vehicle.

While the Federal Motor Carrier Safety Regulations have required rear impact guards for more than 65 years, they are not included on the list of components in Appendix G that must be inspected during the annual CMV inspection. This means that a vehicle can pass an annual inspection with a missing or damaged rear impact guard – although the rear impact rules already require that they remain installed and in safe and proper operating conditions at all times.

In a petition asking for the change, the Commercial Vehicle Safety Alliance noted that a vehicle’s rear impact guard/rear end protection is inspected roadside as part of the North American Standard Inspection Program. However, the majority of commercial motor vehicles do not come into contact with an inspector on an annual basis.

In addition, several senators asked the General Accountability Office to review data on truck underride crashes and information on underride guards. Between January 2018 and March 2019, GAO conducted a performance audit that included a literature review and interviews with stakeholders familiar with underride crashes and guards. GAO Report GAO-19-264, published in March 2019, concluded that the lack of an annual inspection requirement for rear impact guards potentially affects the safety of the traveling public and FMCSA’s ability to achieve its safety mission. GAO stated that “without explicitly including the inspection of the rear guard in Appendix G, there is no assurance that rear guards in operation will be inspected at least annually to ensure they perform as designed to prevent or mitigate an underride crash.”

FMCSA also is proposing to amend the FMCSRs to be consistent with changes that were made to National Highway Transportation Safety Administration regulations that excluded RCC horizontal discharge semitrailers from the rear impact guard requirements. RCC horizontal discharge trailers are used to deliver asphalt to road construction sites and gradually to discharge asphalt mix into paving machines. Typically, the paving machine attaches to the rear axle of the RCC horizontal discharge trailer via hydraulic arms, and the edge of the trailer’s conveyor belt extends over the paving machine opening. A rear impact guard required by the FMVSS would prevent the RCC horizontal discharge trailer from effectively connecting with a paving machine. NHTSA concluded that installation of rear impact guards on RCC horizontal discharge trailers would interfere with the intended function of the trailers and therefore exempted them from the standard.

Another change that would adopt NHTSA requirements in the FMCSRs is allowing the rear impact guard certification label to be mounted on either the forward- or rearward-facing surface of the horizontal member of the guard, provided the label does not interfere with the retroreflective sheeting required by the FMVSS.

More information and how to comment can be found here.





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