Quote:
Originally Posted by KTMMAN
the reason trucks sit at 55mph is because they are goverened to theat speed (56) nowt to do with fuel economy etc , its basically as fast as they can go !They all travel at the same speed to keep momentum up as tarffic managers tend to run to tight timescales to make any money.
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Chicken and egg, I believe they are set at that speed more for the best balance of economy and driver safety.