The 'Intergreen time' at a traffic signal is the time between:
Choose the correct answer
Peak hour and off-peak hour
End of green of one phase and start of green of next — amber/all-red time to clear conflicting vehicles from intersection
Morning and evening peak periods
Two consecutive green phases on the same approach
Correct Answer
B. End of green of one phase and start of green of next — amber/all-red time to clear conflicting vehicles from intersection
Why is this the answer?
Intergreen (clearance) time = all-red + amber time. Purpose: clear vehicles that entered intersection during end of green. Calculation: IG = t_perception + clearance time from last entry point. Includes amber (orange) phase (typically 3–5 s for vehicles to stop or proceed). All-red ensures no conflict. Effective green = green + amber − start loss.
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