Question:
Which one of the following factors is not taken into account for computing braking distance?
Which one of the following factors is not taken into account for computing braking distance?
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Remember:
\[
\boxed{
SSD=\text{Reaction Distance}+\text{Braking Distance}
}
\]
Reaction time affects only the reaction (lag) distance, not the braking distance.
Updated On: Jul 23, 2026
- Reaction time
- Speed
- Coefficient of longitudinal friction
- Gradient
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The Correct Option is A
Solution and Explanation
Concept:
Stopping sight distance (SSD) consists of:
\[
\boxed{
SSD=\text{Lag Distance}+\text{Braking Distance}
}
\]
Braking distance depends on:
• Speed of the vehicle.
• Coefficient of longitudinal friction.
• Road gradient. Reaction time affects only the lag distance and not the braking distance.
Step 1: Write the braking distance expression. For a level road, \[ BD=\frac{V^2}{2gf} \] where \[ V=\text{Speed}, \] \[ g=\text{Acceleration due to gravity}, \] \[ f=\text{Coefficient of longitudinal friction}. \] For sloping roads, gradient is also included.
Step 2: Identify the factor not involved. Reaction time contributes to the lag distance before braking begins. Hence, \[ \boxed{\text{Reaction time is not considered while computing braking distance}.} \] Therefore, the correct option is \[ \boxed{(A)\;\text{Reaction time}.} \]
• Speed of the vehicle.
• Coefficient of longitudinal friction.
• Road gradient. Reaction time affects only the lag distance and not the braking distance.
Step 1: Write the braking distance expression. For a level road, \[ BD=\frac{V^2}{2gf} \] where \[ V=\text{Speed}, \] \[ g=\text{Acceleration due to gravity}, \] \[ f=\text{Coefficient of longitudinal friction}. \] For sloping roads, gradient is also included.
Step 2: Identify the factor not involved. Reaction time contributes to the lag distance before braking begins. Hence, \[ \boxed{\text{Reaction time is not considered while computing braking distance}.} \] Therefore, the correct option is \[ \boxed{(A)\;\text{Reaction time}.} \]
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