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Q: The system of signal in which clusters of signals along a route display an opposite indication at the same moment is called______.
  • A. flexible progressive system
  • B. alternate system
  • C. simultaneous system
  • D. simple progressive system
Correct Answer: Option B - Alternate system–A signal system in which the alternate signals or groups of signals give opposite indications for a given street at the same time. Simultaneous system–Signal system in which all signals always give the same indication. Flexible progressive system–Signal system in which the intervals at any signal may be independently adjusted to the traffic requirements at the intersections. Simple progressive system–Signal system in which the various signal faces controlling a given street give 'GO' indication in accordance with a timing schedule to permit continuous operation of groups of vehicles along the street at the street at a planned rate of speed which may vary in different parts of the system.
B. Alternate system–A signal system in which the alternate signals or groups of signals give opposite indications for a given street at the same time. Simultaneous system–Signal system in which all signals always give the same indication. Flexible progressive system–Signal system in which the intervals at any signal may be independently adjusted to the traffic requirements at the intersections. Simple progressive system–Signal system in which the various signal faces controlling a given street give 'GO' indication in accordance with a timing schedule to permit continuous operation of groups of vehicles along the street at the street at a planned rate of speed which may vary in different parts of the system.

Explanations:

Alternate system–A signal system in which the alternate signals or groups of signals give opposite indications for a given street at the same time. Simultaneous system–Signal system in which all signals always give the same indication. Flexible progressive system–Signal system in which the intervals at any signal may be independently adjusted to the traffic requirements at the intersections. Simple progressive system–Signal system in which the various signal faces controlling a given street give 'GO' indication in accordance with a timing schedule to permit continuous operation of groups of vehicles along the street at the street at a planned rate of speed which may vary in different parts of the system.