41.1. Overview

Try these first

1. 1.

   Define a traffic signal.

   Hint

   Think about where you see these lights.

2. 2.

   What does 'time sharing' mean in traffic management?

   Hint

   What happens at an intersection with many directions?

3. 3.

   What is the primary purpose of a traffic signal?

   • To control traffic
   • To influence speed
   • To increase vehicle count

   Hint

   Consider why they are placed at intersections.

4. 4.

   True or False: Traffic signals can only improve traffic flow.

   • True
   • False

   Hint

   Think about your experience waiting at red lights.

5. 5.

   Design a simple traffic signal plan for a four-way intersection considering peak hours. Explain your reasoning.

   Hint

   Think about the most common traffic patterns.

6. 6.

   Analyze how introducing left turn signals can affect stopped delays at a signalized intersection.

   Hint

   What happens when vehicles need to yield for turns?