Question

The distance travelled by a moving vehicle during perception and brake reaction time is known as .........

• A. sight distance
• B. stopping distance
• C. lag distance
• D. perception distance

Hint:

Lag distance is a key component of stopping sight distance. It depends on the driver's reaction time and the speed of the vehicle.

Answer 1

The Correct Option is C

Step 1: Understand the scenario described in the question
The question mentions two phases: perception time and brake reaction time. During this time, the vehicle continues to move before actual braking starts.
Step 2: Define lag distance
Lag distance is the distance a vehicle travels from the moment the driver perceives a danger to the moment they actually apply the brakes.
Step 3: Differentiate other options
- Sight distance refers to the length of road visible to the driver.
- Stopping distance is the total distance traveled during perception, reaction, and braking.
- Perception distance is only the distance traveled during the perception time, not including brake reaction time.
Step 4: Conclusion
Since the question includes both perception and brake reaction time, the correct term is lag distance.