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Explain the Clearance Interval - Signalized Intersections
Also known as "Red Clearance Interval" and "All Red"
r = (w+L) / V - If there is no pedestrian traffic
r = (P+L) / V If there is pedestrian traffic or the crosswalk is protected by ped. Signal
Where: r = length of red clearance interval (sec)
w = width of intersection; more precisely, the length of the vehicle path from the departure stop line to the far side of farthest conflicting traffic lane (ft)
P = width of intersection; more precisely, the length of the vehicle path from the departure stop line to the far side of farthest conflicting ped crosswalk (ft)
L = Length of vehicle (20 ft generally used)
v = speed of vehicle through intersection (fps)
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