4.2.3. Reaction time

Try these first

1. 1.

   What does reaction time refer to?

   Hint

   Think about your response to a traffic light.

2. 2.

   Can you name one stage of reaction time?

   Hint

   It's the first step in responding to a stimulus.

3. 3.

   What are the four stages of reaction time?

   Hint

   Remember the acronym PIEV.

4. 4.

   True or False: The 85th percentile value is used in traffic design to ensure safety.

   • True
   • False

   Hint

   Consider how we accommodate the majority of users.

5. 5.

   Analyze a scenario where a driver encounters a sudden obstacle. Describe the reaction time stages involved and how external factors might influence this process.

   Hint

   Consider each stage and what might affect it.

6. 6.

   Propose a design solution for traffic lights that accounts for varying reaction times. Describe your approach and the reasoning behind your choices.

   Hint

   Draw on studies regarding reaction time variability.