Relating to transportation.

Directs the department to provide refunds to taxpayers who overpaid weight-mile taxes. Directs the Oregon Department of Administrative Services to decrease either the weight-mile tax or the motor vehicle fuel taxes if the highway cost allocation study indicates that a vehicle class is paying more than its fair share for the use of the highways in the state and the Legislative Assembly does not enact a measure to correct the imbalance within 120 days of the Joint Committee on Transportation receiving a report on the study. Revises the formula for weight-mile taxes. Provides for diesel fuel to be taxed in the same manner as gasoline. Modifies the definition of "combined weight" for purposes of motor carrier regulation. Allows the Department of Transportation to use a motor carrier's registration card as the tax enrollment document instead of the vehicle's weight identifier. Eliminates reinstatement fees for weight identifiers.