Transportation Engineering Questions and Answers Part-7

1. What is the range of fairly clear vision cone?
a) 10° – 15°
b) 10° – 12°
c) 3° – 10°
d) 60° – 90°

Answer: b
Explanation: 10° – 12° is the range of fairly clear vision cone. Vision of the driver beyond this range is blurred.

2. Some _______ pigment has been added to green lights and some ________ pigment has been added to red light to make it easier for the colourblind drivers to distinguish it.
a) blue, yellow
b) red, green
c) yellow, blue
d) green, red

Answer: a
Explanation: Some blue pigment has been added to green lights and some yellow pigment has been added to red light to make it easier for the colourblind drivers to distinguish it since colourblind people cannot distinguish between red and green.

3. Glare effects can be minimized by decreasing the height of lights.
a) True
b) False

Answer: b
Explanation: Glare effects can be minimized by increasing the height of lights. It can also be decreased by reducing the brightness of light and positioning it farther from the roadway.

4. What do Raised markers on a pavement indicate?
a) Cycle trail
b) Mandatory reduction in speed of the vehicle
c) Railway track ahead
d) Two-way lane demarcation

Answer: b
Explanation: Raised markers on a pavement indicate a mandatory reduction in speed of the vehicle on some highways.

5. Which visual reception affects the ability of a driver to estimate speed, distance, size, and acceleration?
a) Hearing perception
b) Depth perception
c) Glare vision
d) Visual acuity

Answer: b
Explanation: The visual reception which affects the ability of a driver to estimate speed, distance, size, and acceleration is Depth perception. This is extremely important in two-way highways. Therefore traffic control devices are standard in size, shape, and colour to provide sufficient information to drivers to make important decisions.

6. What is the recovery time when the driver moves from light to dark condition?
a) 3 seconds
b) 2 seconds
c) 6 seconds
d) 5 seconds

Answer: c
Explanation: The recovery time when the driver moves from light to dark condition is 6 seconds. The recovery time when the driver moves from dark to light condition is 3 seconds. It is also termed as Glare recovery.

7. What does the etching on the outside edge of the shoulder on a highway pavement indicate to a driver?
a) Vehicle leaving the pavement surface
b) Vehicle entering a different lane
c) Vehicle entering a construction site
d) Vehicle entering the pedestrian lane

Answer: a
Explanation: The etching on the outside edge of the shoulder on a highway pavement indicates to a driver that the vehicle is leaving the pavement surface.

8. The cone for peripheral vision is typically 160°. On what does this value depend on?
a) Speed of vehicle and hearing perception
b) Speed of vehicle and age of driver
c) Age of driver and depth perception
d) Age of driver and glare recovery

Answer: b
Explanation: The cone for peripheral vision is typically about 160°. This value depends on the speed of vehicle and age of the driver. The range of peripheral vision is 120° to 180°.

9. What is Gap Acceptance?
a) Minimum gap required to change the lane safely
b) Maximum gap required to change the lane safely
c) Minimum gap required in between parked cars
d) Maximum gap required in between parked cars

Answer: a
Explanation: Gap Acceptance is the minimum gap required to change the lane safely. It is the minimum space necessary between the vehicles for it to comfortably switch lanes. The gap required will be higher when the vehicles want to switch from slow-moving traffic lane to fast-moving lane.

10. The visibility difficulty that the driver faces at night is due to _____________
a) Depth perception
b) Glare vision
c) Visibility perception
d) Colour blindness

Answer: b
Explanation: Glare vision decreases the ability of a driver to see. Depth perception influences the driver of its aptness to estimate speed and distance.