## Highway Engineering Questions and Answers - Traffic Characteristics Part-2

1. The most likely cause of accidents is ___________
a) Impatience in driving
b) Slow speed of vehicle

Explanation: The most likely cause in this case is impatience in driving as it may lead to anxiety and fear; this mostly affects the user psychologically.

2. The width recommended by IRC for all type of vehicles is ___________
a) 1.5m
b) 2.0m
c) 2.5m
d) 3.0m

Explanation: IRC recommends a width of 2.5m for any type of vehicle.

3. The stability of a vehicle is influenced by ___________
a) Width of wheel base only
b) Width of wheel base and height of gravity
c) Height of gravity only
d) Length of vehicle only

Explanation: The stability of a vehicle is influenced greatly by width of wheel base and height of center of gravity is useful near horizontal curves.

4. The height of the vehicle mainly influences?
a) Width of pavement
b) Length of curve
c) Clearance under structures
d) Design velocity

Explanation: The clearance of structures like over bridges and under bridges mainly depends on the height of the vehicle.

5. The minimum number of parameters needed to measure brake efficiency is?
a) One
b) Two
c) Three
d) Four

Explanation: The parameters required for measuring brake efficiency are initial speed; braking distance and actual duration of braking application in these three parameters any two of them are needed.

6. If the acceleration of the vehicle is 6.17m/sec2 then the average skid resistance is?
a) 0.61
b) 0.62
c) 0.63
d) 0.64

Explanation: The average skid resistance f=a/g
f=6.17/9.81
=0.63.

7. What is the first stage in traffic engineering studies?
a) Traffic volume studies
b) Spot speed studies
c) Speed and delay studies
d) Origin and destination studies

Explanation: The first step in traffic engineering studies is traffic volume studies, which are carried out to understand the traffic characteristics.

8. The traffic volume is usually expressed in __________
a) LMV
b) PCU
c) LCV
d) HCV

Explanation: In India the traffic is heterogeneous so there are many types of vehicles, so every vehicle is expressed with the same unit PCU which means passenger car unit.

9.The number of vehicles that pass through a transverse line of road at a given time in a specified direction is called __________
a) Traffic studies
b) Traffic flow
c) Traffic origin
d) Traffic destination