13.2.1. Stopping Sight Distance (SSD)

Try these first

1. 1.

   What is Stopping Sight Distance?

   Hint

   Consider what distance ensures safety from collisions.

2. 2.

   State the formula for lag distance.

   Hint

   Think about how far the car travels before braking starts.

3. 3.

   What does Stopping Sight Distance (SSD) measure?

   • Distance to travel before brake application
   • Distance needed for safe stopping
   • Distance at which reactions initiate

   Hint

   Focus on the outcome, what SSD ensures.

4. 4.

   True or False: Lag distance and braking distance are the same.

   • True
   • False

   Hint

   Remember when each occurs during stopping.

5. 5.

   A vehicle moving at 90 km/h encounters a stopped vehicle. Calculate the SSD needed considering a reaction time of 2.5 seconds and a friction coefficient of 0.6.

   Hint

   Convert km/h to m/s for accurate calculations.

6. 6.

   How would SSD calculations differ on an inclined road? Illustrate with an example.

   Hint

   Think of how gravity affects the effective stopping ability.