13.2.5. Safe Sight Distance to Enter into an Intersection

Try these first

1. 1.

   What is sight distance?

   Hint

   Think about what distance drivers need to see obstacles.

2. 2.

   How long is the typical reaction time considered in design?

   Hint

   Remember the IRC recommendation!

3. 3.

   What is the typical reaction time used for design?

   • 1.5 seconds
   • 2 seconds
   • 2.5 seconds

   Hint

   Remember the design standard from the IRC.

4. 4.

   True or False: Higher vehicle speed requires a shorter stopping distance.

   • True
   • False

   Hint

   Think about how speed impacts travel time.

5. 5.

   A vehicle is traveling at 70 km/h on a highly frictional road (f=0.4). Calculate the SSD considering a reaction time of 2 seconds.

   Hint

   Make sure all units are consistent before solving.

6. 6.

   Consider a situation where a car is going downhill with a 3% gradient at a speed of 60 km/h. Calculate the adjusted stopping sight distance.

   Hint

   Remember how gravity operates on the inclination.