Street Design Manual

Table 16 Right Turn/Deceleration Lengths Table Design Speed (mph)

Right Turn/Deceleration Length (feet) Desirable (1) Minimum (2)

30 35 40 45 50 55

235 270 315 375 435 480

185 240 295 350 405 450

(1) Assumes stop condition (2) Assumes 15 mph speed differential Section 12.2.4 Approach, Departure and Bay Taper Approach, Departure and Bay Taper length for separate turn lanes shall be based on the following formulas:

Approach and Departure Taper for Speeds <= 40 mph = ∗ Approach and Departure Taper for Speeds > 40 mph = ∗ Where, L = taper length, (feet)

W = width of offset, (feet) S = design speed, (mph)

Raleigh Street Design Manual – Page 94