Traffic Signal Study. The traffic signals on Elm Street are observed to be operating on a 75-second cycle length. Two streets that cross Elm are First and Second Streets, which are 1/12 mile apart. The signal on Elm at First is observed “turning green” at 16:24:17 EST one afternoon. A few minutes later, we reach Second Street and see the beginning of the green phase on Elm at Second at 16:29:35.
(a) If the Elm Street signal at First is the “master signal,” what is the offset of the signal on Elm at Second Street?
(b) The Green + Yellow phases on Elm at First total 47 seconds. These phases total 39 seconds at Second Street. What is the slowest speed any vehicle could travel through a green light at First Street and not be slopped by the next red light at Second Street?
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