Advantages
- Safety
- Removes left-turning vehicles from travel lanes, particularly from higher-speed left lanes.
- Pedestrian crossing distance is reduced across the mainline.
- Reduced left-turn conflict points as compared to a standard four-leg intersection.
- Removes conflicts with right-turning vehicles and pedestrians/bicyclists at the primary intersection.
- Operations
- Reduced overall travel time and delay through the intersection.
- Reduced signal phases due to the elimination of the associated left-turn phase(s).
- Increases queuing space for left-turning vehicles.
- Shorter pedestrian crossing distance across the mainline may provide for shorter cross street signal phases.
- May improve U-turns by reducing the need for a tight-radius turning maneuver which conflicts with cross-street right-turns.
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