# Traffic Engineering Questions and Answers – Multilane Highway Capacity

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

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

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

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

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?
b) Right turns
d) Traffic signals

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.
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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)

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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