This set of Traffic Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Multilane Highway Capacity”.
1. Which of the following is not a correction or adjustment required for multi-lane highways?
a) Lane width
b) Lateral clearance
c) Median time
d) Length of highway
View Answer
Explanation: Length of highway adjustment is not a correction or adjustment that is required for multi-lane highways. The lane width, lateral clearance, median time, and excess points adjustments are required for multi-lane highways.
2. What is the free-flow speed (FFS) of a multilane highway?
a) FFS = BFFS-flw-flc-fm-fa
b) FFS = BFFS+flw-flc-fm-fa
c) FFS = BFFS-flw-flc-fm+fa
d) FFS = BFFS-flw+flc-fm-fa
View Answer
Explanation: The free-flow speed (FFS) of a multilane highway is FFS = BFFS-flw-flc-fm-fa. Here, FFS=free flow speed, BFFS=base FFS, flw=adjustment for lane width, flc= adjustment for lateral clearance, fm=adjustment for median type, and fa=adjustment for excess point.
3. How much does the FFS decrease when 10 foot lanes are used?
a) 6.6 mph
b) 6 mph
c) 10 mph
d) 2 mph
View Answer
Explanation: FFS decrease by 6.6 mph when 10 foot lanes are used. This is referred from exhibit 21-4 (adjustment of lane width) of the Highway Capacity Manual.
4. Calculate flc (lateral clearance) for a 4 lane highway with milepost markers which are located 3 feet to the right of the travel lane?
a) 9
b) 11
c) 5
d) 6
View Answer
Explanation: Lateral clearance, flc = LCright + LCleft
= 6 + 3 = 9
The flc (lateral clearance) for a 4 lane highway with milepost markers which are located 3 feet to the right of the travel lane is 9 feet.
5. Which of the following is the factor that affects the flow on multilane highways?
a) Uncontrolled excess form roadside
b) Right turns
c) Controlled excess form roadside
d) Traffic signals
View Answer
Explanation: Uncontrolled excess form roadside is one of the factors affecting the flow on multilane highways. The other factor is the left turns taken by the motorists.
6. Equivalent flow rate is calculated by which of the following?
a) vp = V/(PHF x N x fhv x fp)
b) vp = V x (PHF x N x fhv x fp)
c) vp = V/(PHF + N x fhv x fp)
d) vp = V/(PHF x N + fhv x fp)
View Answer
Explanation: Equivalent flow rate is calculated using vp = V/(PHF x N x fhv x fp). Here, vp = equivalent flow rate, V = directional hourly volume, PHF = peak hour factor, N = number of lanes in one direction, fhv= heavy vehicle adjustment factor, and fp = driver population adjustment factor.
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