Each year TxDOT re-calculates road user costs, which the department sets for use in A + B bidding, incentive/disincentives for milestones, final substantial completion and lane rentals.

Road User Costs Per Vehicle Hour
Year Car Truck Memo
2018 $28.69 $36.28
2017 $22.40 $32.70
2016 $22.12 $32.30
2015 $22.09 $32.26
2014 $21.73 $31.71

Beginning March 2018, the Texas A&M Transportation Institute (TTI) uses the methodology outlined in the report Updated Estimate of Roadway User Cost for Personal Vehicles and Commercial Trucks to calculate the value of time.