U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
Definition: Length of acceleration lane, not including taper. For tapered ramps, this would be measured from point of tangency of the last ramp curve to the point where the ramp lane width becomes less than 12 feet. For parallel ramps, this would be measured from nose of painted gore to beginning of taper.
See Figure 20 for additional detail.
HPMS/Tool Requirements: None
Figure 20. Illustration of Acceleration Lane Length for Tapered and Parallel Designs.