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Michael Cannot add to the NAASRA specification (I was involved in Victoria in looking at the spec's at that time) except to comment that there have been significant changes in workplace safety requirements since 1987. Based on actual tests I have done with heavy vehicles, I know that a 3% slope is sufficient for a heavy vehicle to start rolling if the brakes come off - can start moving below that figure. Suggest that either the slop be decreased to say 2% or alternately details of a safe system of work that will prevent the vehicle rolling while being inspected and/or weighed are included in the guidelines. Regards John Lambert MIEAust, CPEng 180 785 Bachelor of Engineering (University of Melbourne), ARMIT (Mechanical) 235 Wandana Drive, Wandana Heights, Victoria, 3216 Australia Phone: [61 3] 5249 1228 Fax: [61 3] 5249 1146 Mobile or cell phone: 0417 033 258 Email: [log in to unmask]