Time-Space Invaders Question 1. Which of the following is NOT true about Time-Sp

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Time-Space Invaders

Question 1. Which of the following is NOT true about Time-Space Diagrams:
a. A time-space diagram is an effective tool to study coordinated traffic control settings.
b. The vehicles' trajectories can intersect in a time-space diagram.
c. The speed of the vehicles can be represented by the slope of the trajectories
d. Delay cannot be estimated from time-space diagrams

Question 2. The vehicles stopping at an intersection will have their trajectories in Time-Space Diagram:
a. Parallel to time axis
b. Parallel to space axis
c. Could be either a) or b) depending on the time and location of the vehicles
d. None of the above

Question 3. The offsets
a. Can be negative
b. Should be greater than 0 and less than half a cycle length
c. Are referenced to the beginning of the green phases
d. Are parameters that can affect the delay in coordinated controlled arterial

Question 4. Comparing the cycle lengths of two adjacent coordinated controlled intersections, you will find in most of the cases that:
a. They are equal to each other's
b. The downstream intersection has bigger cycle length
c. The downstream intersection has small cycle length
d. They are independent from each other's

Question 5. Which statement about the optimal offset is NOT true
a. There is no optimal offset for an isolated intersection if only one direction is considered
b. There is no optimal offset for an isolated intersection if two direction are considered
c. There is no optimal offset for two adjacent intersections if two directions are considered
d. None of the above

Question 6. The optimal offset between two adjacent intersections
a. Is equal to the distance between the intersections divided by the design speed
b. Will lead to the vehicles trajectories between the two intersections being straight lines and parallel to each other's
c. Does not need to be adjusted when changing from considering one direction to two directions
d. None of the above is true

Explanation / Answer

1. D-Delay cannot be estimated from time-space diagrams

2.C- Could be either a) or b) depending on the time and location of the vehicles

3.D- Are parameters that can affect the delay in coordinated controlled arterial

4.C- downstream intersection has small cycle length

5.D- none of the above

6.C-Does not need to be adjusted when changing from considering one direction to two directions

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