A lane mile is a mile of roadway in a single driving lane. The total lane mileage of a highway is found by multiplying the centerline mileage of a road by the number of lanes it has. Lane mileage is the total amount of mileage covered by a road’s lanes.

Lane Mile illustration

Illustration: Lane Mile

 

Lane Mile photo

Source: The illustration above represents what the public will see on our highways as a Lane Mile.

A. 2 lanes x 0.5 mile = 1 lane mile

B. 4 lanes x 0.5 mile = 2 lane miles