APUs (Auxiliary Power Units) are frequently used by truck drivers to limit fuel use since they reduce the need for trucks to run engines on idle while they’re parked. But seeing as they often weigh several hundred pounds, they may create a problem for drivers who regularly carry around the maximum weight limits. With the president’s latest expansion of the MAP-21 bill dealing with state-by-state APU regulations, this may be puzzling to drivers that cross state lines.

Below we’ve included a guide, put together by GPS vehicle tracking company Track Your Truck, which informs drivers exactly how much weight is exempt in every state.

Check it out:

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