Term
| What are the purposes of traffic signals?(3 bullets) |
|
Definition
-Improve overall safety
-Decrease average travel time and increase capacity through an intersection
-Equalize the quality of service for all or most traffic streams |
|
|
Term
| What are the benefits of traffic signals? (5 bullets) |
|
Definition
-reduce right-angle collisions
-Orderly traffic
-Continuous flow
-Allow other vehicles and pedestrians to cross a heavy traffic stream
-Control traffic more economically than manual methods |
|
|
Term
| What are the basic timing elements of a traffic signal? |
|
Definition
-Green interval
-Amber interval
-All-red interval
-Inter green interval |
|
|
Term
| What is the dilemma zone? |
|
Definition
When Inter green < I minimum
Vehicles in the dilemma zone can neither stop nor continue safely |
|
|
Term
| What is saturation flow rate? and its units? |
|
Definition
| How quickly vehicles empty out, Veh/hr/lane |
|
|
