Road costing

The Overhead Wire, in "Replay: The Truth About Roads," links to a Texas Department of Transportation webpage on the cost of roads. By comparing the cost of road to the amount of gasoline tax likely to be generated from use, it can be determined whether or not the road pays for itself. According to TxDOT, for the most part roads must be subsidized by taxes other than state or federal gasoline excise taxes.

From the webpage:

When is a given road actually “paid for?”

Just like your car, it never is. You may have paid the note, but maintenance and fuel costs go on as long as you own the vehicle. Once a road is built, maintenance and rehabilitation costs last its entire life, generally about 40 years.

The decision to build a road is a permanent commitment to the traveling public. Not only will a road be built, but it must also be routinely maintained and reconstructed when necessary, meaning no road is ever truly “paid for.”

Until recently, when TxDOT built or expanded a road, no methodology existed to determine the extent to which this work would be paid off through revenues. The Asset Value Index, was developed to compare the full 40-year life-cycle costs to the revenues attributable to a given road corridor or section. The shorthand version calculates how much gasoline is consumed on a roadway and how much gas tax revenue that generates.

The Asset Value Index is the ratio of the total expected revenues divided by the total expected costs. If the ratio is 0.60, the road will produce revenues to meet 60 percent of its costs; it would be “paid for” only if the ratio were 1.00, when the revenues met 100 percent of costs. Another way of describing this is to do a “tax gap” analysis, which shows how much the state fuel tax would have to be on that given corridor for the ratio for revenues to match costs. Applying this methodology, revealed that no road pays for itself in gas taxes and fees.