The NHVR’s National Roller Brake Test Procedure required machines used to conduct tests are calibrated in accordance with the manufacturers’ standards every 12 or 24 months.
Manufacturers reported difficulty in achieving some of the calibration requirements because of the current travel restrictions.
In response to this feedback, the NHVR has updated the Vehicle Standards Guides 21 – National Roller Brake Testing Procedure to ensure ongoing testing is reliable while travel restrictions are in place.