# Highway Engineering Questions and Answers – Traffic Engineering Studies and Analysis – 2

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This set of Highway Engineering Interview Questions and Answers for Experienced people focuses on “Traffic Engineering Studies and Analysis – 2”.

1. The annual average daily traffic is calculated by which of the formula?

2. Running speed of a vehicle is equal to __________
a) Travel speed+ delay
b) Travel speed
c) Travel speed-delay
d) Average of travel speed and delay

Explanation: The running speed of a vehicle is obtained by dividing the distance with a time of travel and subtracting the delays.

3. The speed at any instant of time is called __________
a) Running speed
b) Travel speed
c) Spot speed
d) Space speed

Explanation: The speed at any instant of time is called as spot speed or instantaneous speed, running speed is during travel and the average speed of travel is travel speed.

4. Which of the following relationship is correct?
a) Travel speed= running speed
b) Travel speed< running speed c) Travel speed>running speed
d) Travel speed=1.5 times of running speed

Explanation: Running speed is always greater than travel speed as the travel speed always includes the stopped delays.

5. Peak hour factor is expressed in percentage of __________
c) PCU
d) DF

Explanation: Peak hour factor is expressed in the percentage of AADT; it is used in the design of transportation facilities and major projects.

6. How many types of traffic speed studies are conducted?
a) One
b) Two
c) Three
d) Four

Explanation: There are two types of studies conducted for speed, they are (i) spot studies (ii) speed and delay studies.

7. If the distance of a vehicle moved is 25m and the observed travel time is 15 sec then space mean speed is?
a) 4m/s
b) 5m/s
c) 6m/s
d) 7m/s

Explanation: Space mean speed=3.6*25/15
=6m/sec.

8. If space mean speed of a vehicle is 50kmph, then the time mean speed will be __________
a) Less than 50kmph
b) Greater than 50kmph
c) Equal to 50kmph
d) Depends on the vehicle

Explanation: The Time mean speed will always be greater than space mean speed and it will be greater than 50kmph.

9. If the instantaneous speed of 4 vehicles are 35, 40, 45 and 50 then the time mean speed will be __________
a) 40kmph
b) 41 kmph
c) 41.5kmph
d) 42.5kmph

Explanation: The space mean speed is given by
Vt=V1+V2+V3+V4/(4)
=35+40+45+50/ (4)
=42.5kmph.

a) 85th percentile speed
b) 15th percentile speed
c) 98th percentile speed
d) 100 percentile speed 