Street Design Manual

Figure 4 Right Turn/Deceleration Warrants

Section 12.2.2 Total Turn Lane Length A separate turning-lane consists of a taper plus a full width turn lane. The design of the lane is based primarily on the speed at which drivers will turn into the lane, the speed to which drivers must reduce in order to turn into the driveway or side street after traversing the deceleration lane, and the amount of vehicular storage that will be required.

The total length of the turning lane and taper should be determined by either: a) The combination of turn lane or through lane queue storage plus the bay taper, or b) Right turn / deceleration requirements, whichever is greater. Section 12.2.3 Turn Lane Storage A. Signalized Intersection

Raleigh Street Design Manual – Page 91