A hook turn (also known as a perimeter-style turn in Canada) is a road cycling maneuver and traffic-control mechanism in which vehicles that would normally turn from the closest lane of an intersection instead turn from the farthest lane, across all other lanes of traffic.
Hook turns are commonly used by cyclists as a safer alternative to merging with motor vehicles, or having to cross multiple lanes of traffic to reach a turning lane.
The legal use of hook turns by motor vehicles is relatively rare, but has been implemented in some jurisdictions (notably Melbourne, Australia) to keep the center of a road free from congestion for use by trams or other services.
Performing a hook turn
The Australian Road Rules set out the procedure for performing a hook turn in Australia, as well as other jurisdictions with left-hand traffic. In jurisdictions with right-hand traffic the lane of the turning vehicle is reversed.
- When the traffic light is green, the turning vehicle approaches and enters the intersection from as near as possible to the left. If there is insufficient room then it must wait for the next cycle of the lights.
- The vehicle moves forward, keeping clear of any marked foot crossing, until it is as near as possible to parallel with the left-most lane of the road the vehicle is entering.
- The vehicle remains at this position until the traffic lights on the road it is entering change to green.
- The vehicle then turns right into the road and continues straight ahead.
History and usage
In many jurisdictions lightweight vehicles, such as bicycles and mopeds, may make hook turns at any intersection regardless of signage. For instance, under the Australian Road Rules cyclists may legally perform a hook turn at any intersection unless otherwise signed.
Hook turns were originally the standard right turn in Australia. Various jurisdictions phased them out at different times. For example Melbourne changed to centre turns in 1954 for all right turns except for certain Central Business District intersections, in order to maintain a clearway in the center of major roads for the city's extensive tram network. Sydney and Newcastle changed to centre turns in 1939. By requiring vehicles to turn from the far lane, rather than the middle of the road, the hook turn was able to avoid conflicts between vehicles and trams without the need for extra traffic lanes or altered signals.
There have been limited proposals for hook turns to be implemented as a more widespread replacement for conventional intersection turns. Computer modelling has indicated that hook turns have the potential to significantly reduce delays and congestion in most scenarios, and especially where overall traffic flow is high.
In Denmark a hook turn is mandatory for bicycles.
- "Australian Road Rules, s 35". www5.austlii.edu.au. Retrieved 2016-01-13.
- "Road Turns Change". The Mercury. 23 August 1954. Retrieved 2016-01-14.
- "RIGHT-HAND TURN To Be Made from Centre of Road NEW TRAFFIC REGULATION". Sydney Morning Herald. 28 April 1939. Retrieved 2017-03-03.
- Liu, Zhiyuan; Bie, Yiming (16 March 2015). "Comparison of hook-turn scheme with U-turn scheme based on actuated traffic control algorithm". Transportmetrica A: Transport Science. doi:10.1080/23249935.2015.1018855.
- Hounsell, Nicholas; Yap, Yok Hoe (1 February 2015). "Hook Turns as a Solution to the Right-Turning Traffic Problem". Transportation Science.
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