Commonway
Version V. 2026.09.03

Protected bike lane retrofit via lane removal

RFT-CDR-08 Corridor

Protected bike lane retrofit via lane removal

Installs a physically separated bike lane by removing an entire travel lane, the same underlying mechanism as a road diet, applied specifically to create bike facility space.

#Overview

Where narrowing lanes alone doesn't recover enough width for a genuine protected facility, removing a full travel lane does. This is effectively a road diet whose primary purpose, rather than a secondary benefit, is the bike lane it creates. AASHTO recommends this approach specifically where a corridor's traffic volume can absorb the reduced through capacity.

#Where this leads: Target patterns

Bike Highway / Greenway (COL-BHG-04), Default (No Parking, No Direct Access) (ART-DEF-01) with Protected Bike Lane / Cycle Track (ELM-PBL-37)

#Applicability and thresholds

Follows the same volume thresholds as a standard road diet, since removing a lane carries the same through-capacity implications regardless of what the recovered space becomes. Most viable below roughly 19,000 to 25,000 vehicles per day.

#Evidence and effectiveness

FHWA reports crash reductions of up to 29 percent on road diet conversions generally; where the recovered lane specifically becomes a protected bike lane, the same crash-reduction mechanism applies alongside the added bicycling safety benefit of physical separation from traffic.12

#Getting it built

Can move through the construction spectrum the same way a standard road diet does, restriping first, with a protected lane's physical separation elements (curbs, planters, or flexible posts) added at the quick-build stage before permanent construction. See Construction Methodology & The Build Spectrum.

#Who can move this

Usually a city or county transportation department decision, following the same approval path as a standard road diet. See Legal & Planning Mechanisms.

Protected bike lane retrofit via lane-width reallocation (RFT-CDR-07), Protected bike lane retrofit via parking reduction (RFT-CDR-09) (the other two approaches to the same underlying goal, distinguished by where the recovered width comes from)

#References

  1. Evidence-based Transportation Policy Research, Texas A&M Transportation Institute, "Bicycle Lanes." AASHTO-recommended retrofit approaches without widening the road.
  2. Legal / regulatory Federal Highway Administration, "Road Diets (Roadway Reconfiguration)," Proven Safety Countermeasures, FHWA-SA-12-013.

Suggest changes to this page (opens in new tab) Last updated September 3, 2026