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The design of bike lanes at intersections is complicated by the need to accommodate numerous turning movements by both motor vehicles and bicyclists, often with limited available space. The recommended designs are based on the assumption that:

  • motorists making right turns should make their turn from as close to the right-hand curb as practicable
  • bicyclists going straight ahead should be to the left of right turning traffic
  • bicyclists turning left should turn from a left turn lane or left side lane
Bike lane @ uncontrolled intersection: bike lane stripes should not be extended through a pedestrian crosswalk or any street intersection (with the exception of dashed lines through some complex intersections)

Bike lane @ controlled intersection: bike lane stripe ends at stop line or crosswalk with right turning traffic bike lane dashed for final 50ft-200ft (15m-60m) with bus stop bike lane dashed for length of bus stop

Bike lane @ intersection w/right turn lane: see diagram (page 29 aashto guide)

Bike lane @ intersection w/left turn lane: optional bike lane stripe to right of left turning vehicles

Bike lane @ modern roundabout: discontinue lane 35-65 feet (10m-20m) prior to low speed roundabout

Bike lane @ multi-lane roundabout: discontinue lane prior to roundabout; consider separated bikeway, shared use of sidewalks, grade separation or re-routing (none are especially good options)

Bike lane @ high speed interchange: see diagram (p63 aashto)

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