U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
Definition: Width of the outside (curb) through lane (not including parking area, bicycle lanes, gutter pan, etc.). Lane width is measured from center of edgeline to center of centerline or to the center of the lane line (if multilane). If edgeline striping is placed inside the edge of the pavement (within approximately one foot) to keep traffic from breaking the pavement edge, ignore the striping and measure from the pavement edge to the center of a single (or double) centerline stripe or to the center of the lane line (if multilane). If there is no edgeline or centerline, estimate a reasonable split between the actual width used by traffic and the shoulder or parking lane based on State/local design guides.
See Figures 1a – 1c depending on number of lanes and direction of inventory.
HPMS/Tool Requirements: HSM/IHSDM (Required), SafetyAnalyst (Optional)