6.1.8 Speed Change Lanes

Collectors generally incorporate the following types of speed change lanes:
  • Left and right turn lanes;
  • Passing or climbing lanes; and
  • Acceleration and deceleration lanes for entrance and exit ramps.
Speed change lanes should be provided where vehicles must slow to leave a facility or accelerate to merge onto a facility.
The width of a speed change lane should match the through lane width of the facility. See
Section 4.10.2
and
AASHTO’s A Policy on Geometric Design of Highways and Streets
for further discussion on speed change lane widths and their use.