34.3.1. Pipe’s model

Try these first

1. 1.

   What is the recommended following distance according to Pipe’s model at 40 mph?

   Hint

   Think about how many lengths you need for every ten miles.

2. 2.

   Is Pipe’s model accurate at lower speeds?

   Hint

   Consider field studies versus theoretical models.

3. 3.

   According to Pipe's model, how many car lengths should be maintained at 50 mph?

   • 4 car lengths
   • 5 car lengths
   • 6 car lengths

   Hint

   Multiply the speed by one car length per 10 mph.

4. 4.

   True or False: Pipe's model is equally accurate at high and low speeds.

   • True
   • False

   Hint

   Consider how driving dynamics change with speed.

5. 5.

   Create an analysis of traffic flow at different speeds using Pipe’s model. For various speeds (e.g., 15, 30, 45 mph), calculate the required headway distances and discuss the risk involved at lower speeds according to field data.

   Hint

   Use logical reasoning and reference field data for accuracy.

6. 6.

   Discuss how adjustments to Pipe’s model could enhance its applicability in urban traffic with frequent stops and starts. Propose an alternative model that could address these limitations.

   Hint

   Think about incorporating time-based measures instead of just distance.