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APU (Auxiliary Power Units) decrease the need for drivers to run their truck engines on idle while they’re parked and are regularly used to limit fuel use. Although, one disadvantage is that these APUs normally weigh several hundred pounds, which could be a problem for drivers who often carry close to maximum weight limits. With the president’s most recent expansion of the MAP-21 bill dealing with state-by-state APU regulations, this may be confusing to drivers who often cross state lines.

Below we’ve placed a convenient guide on APU regulations, compiled by GPS tracking company Track Your Truck that tells drivers precisely how much APU weight is exempt in each state.

Here’s Your Helpful Guide on APU Regulations