39.4.2. Grade Separated Intersection Control

Try these first

1. 1.

   What is an overpass?

   Hint

   Think about the direction of traffic.

2. 2.

   What do we call the structure that goes under a road?

   Hint

   It’s the opposite of an overpass.

3. 3.

   What is a grade-separated intersection?

   • Intersection with traffic at same level
   • Intersection with different levels
   • Traffic lights controlled intersection

   Hint

   Think about the structure of the intersection.

4. 4.

   True or False: An overpass allows vehicles to travel under another road.

   • True
   • False

   Hint

   Consider the position of the overpass.

5. 5.

   Design a simple grade-separated intersection plan considering urban congestion. Discuss your rationale for using an overpass versus an underpass.

   Hint

   Consider where traffic tends to bottleneck.

6. 6.

   Evaluate the cost implications of building a grade-separated intersection compared to a traditional one.

   Hint

   Think about both construction and ongoing costs.