The mileage-based fee on trucks using Connecticut highways was approved by state policymakers back in 2021 in an effort to generate ongoing revenue to support the Special Transportation Fund, which pays for the upkeep and improvement of roads and bridges.

At the time, state fiscal analysts estimated the law would raise about $90 million a year through a per-mile tax on big rig trucks which will scale with the weight of the vehicle. The fee will range from 2.5 cents per mile for trucks weighing between 26,000 and 28,000 pounds to 17.5 cents per mile for trucks weighing more than 80,000 pounds.