Asphalt pavement is the most common surface for both roadways and trails. The cost model assumes a 3-inch pavement depth.
How the Default Unit Cost was Determined
The unit cost of $135/cubic yard for asphalt or bituminous concrete paving used in the cost model represents the median cost from a sample of 26 bikeway projects that specified the use of asphalt paving. The value represents the midpoint between the cost of widening a bike lane by one foot in Wisconsin in 2002 and the 2004 estimated cost of adding four-foot wide shoulders to a roadway in South Dakota.