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Top Terms > Communication and control > Control > Control system applications > Traffic control > Highway traffic control > Highway traffic control systems > Signalization > Traffic signal cycle > Traffic signal phases > Phases by type of traffic > Left turn phase > Lead-lag phasing

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Lead-lag phasing (Dcmthcskptml)

Definition
A left-turn phase sequence used to accommodate through movement progression in a coordinated signal system. Lead left occurs when left turn movements from one approach or opposing approaches move on an arrow indication prior to the through movement. Lag left occurs when the left turn movement(s) follows the through movement. (Source: http://ops.fhwa.dot.gov/publications/fhwahop08024/chapter4.htm#4.4 and http://www.iowasudas.org/design/Chapter13/13A-1-08.pdf)
Broader Term
Left turn phase (Dcmthcskptm)