This set of Traffic Engineering MCQs focuses on “Traffic Streams, Gap and Gap Acceptance”.
1. What is gap acceptance?
a) Maximum gap required to finish lane changing safely
b) Minimum major-stream headway during which a minor-street vehicle can make a manoeuvre
c) Time interval between the arrival of two cars
d) Minimum gap required to finish lane changing safely
View Answer
Explanation: Gap acceptance is the minimum gap required to change the lane safely. It is the process by which a vehicle moves to an available gap. A gap acceptance model reports how a driver decides whether to accept or not.
2. Which of the following equation can be used to determine the expected number of adequate gaps that will take place at an unsignalized intersection or at the merging area of an expressway?
a) P(0) = P(h>0, h=0) = e—λt
b) P(0) = P(h=0) = e—λt
c) P(0) x P(h>0) = e—λt
d) P(0) = P(h>0) = e—λt
View Answer
Explanation: P(0) = P(h>0, h=0) = e—λt is the equation that can be used to determine the expected number of adequate gaps that will take place at an unsignalized intersection or at the merging area of an expressway.
3. Which of the following is determined by gap acceptance?
a) To determine the delay of vehicles in minor streams aiming to merge onto major streams
b) To determine the maximum gap required to finish lane changing safely
c) To determine the minimum gap required to finish lane changing safely
d) To determine minimum major-stream headway during which a minor-street vehicle can make a manoeuvre
View Answer
Explanation: Gap acceptance determines the delay of vehicles in minor streams which are aiming to merge onto major streams. This depends on the distribution of the arrival of mainstream vehicles at the area of merge.
4. Which of the following is not a parameter of traffic stream?
a) Density of traffic
b) Flow of traffic
c) Speed
d) PCU
View Answer
Explanation: PCU is not a parameter of traffic stream. Density of traffic, flow of traffic and speed are the parameters of traffic stream. The traffic stream parameters can be macroscopic or microscopic.
5. Which of the following is the parameter of traffic stream that has microscopic characteristics?
a) Flow
b) Density
c) Speed
d) Space headway
View Answer
Explanation: Space headway is the parameter of the traffic stream that has microscopic characteristics. Flow, density of traffic and speed are the parameters of traffic stream that has macroscopic characteristics.
Sanfoundry Global Education & Learning Series – Traffic Engineering.
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