Time-Space Diagrams. The green phases on EB Main Street in Mythaca at First. Second, and T...

Time-Space Diagrams. The green phases on EB Main Street in Mythaca at First. Second, and Third Streets, spaced 1/12 mile apart, are observed to start at the times given in the list below.

(a) What is the cycle length at these signals?

(b) If the master controller is at First Street, what are the offsets at Second and Third Streets?

(c) If a driver EB on Main Street crosses First Street at the start of that signal’s green phase and is not impeded by other traffic, what range of speeds will permit her to proceed through the green phase at Second Street without delay? Note: The Main Street approach gets 40 seconds of effective green (G + Y).