Determine the saturation flow rate for a left-turn lane that operates in a permittedonly mode, under the following conditions:
Opposing demand flow rate = 1100 veh/h
Lane width = 11 ft
Heavy vehicles = 3% of the traffic stream
Approach grade = –2%
No on-street parking
No bus stops
Bicycle and pedestrian traffic conflicting with this lane group is negligible
Intersection is not in a central business district
What will be an ideal response?
Step 1: Determine sp,lf. Use Equation 10.54:
Step 2: Determine the saturation flow rate for the left-turn lane. Use Equation 10.53
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