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
View Answer

Answer: d
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

Answer: a
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

Answer: a
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.
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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

Answer: a
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

Answer: a
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)
View Answer

Answer: a
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.

Sanfoundry Global Education & Learning Series – Traffic Engineering.

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To practice all areas of Traffic Engineering, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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