Protectedturn

Protectedturn is a traffic engineering term describing methods that guard turning movements at intersections from conflicting traffic. The approach combines signal-based protections—such as dedicated turn phases and green arrow signals—with physical protections like dedicated turn lanes, medians, and channelized islands. The aim is to reduce crashes and improve safety for motorists, pedestrians, and cyclists when vehicles execute turning maneuvers.

Common implementations include protected left turns, where a separate green arrow or protected phase allows a driver to turn with opposing traffic stopped, and protected right turns, where a dedicated phase allows a right-hand turn without conflicting movements. Many designs also employ physical barriers, such as refuges or islands, to separate turning vehicles from through traffic. Some configurations combine signal protection with pedestrian-first timing to prioritize walkers.

Benefits include lower crash rates for turning movements, clearer right-of-way for all users, and improved pedestrian and cyclist safety. Drawbacks can include added delays for vehicles, higher construction costs, and space requirements that may be challenging in narrow or crowded streets. Effectiveness depends on traffic volumes, intersection geometry, and compliance with signals. Retrofits at existing intersections may require significant planning.

Protectedturn concepts are used in many regions, especially urban centers with high pedestrian activity. Variants exist across jurisdictions, reflecting local design standards and road user priorities. The term is closely related to protected intersections and to the broader practice of channelization and turning bays in traffic engineering.