A 'rotary intersection' (roundabout) is preferred when:
Choose the correct answer
Only two roads intersect at 90°
Multiple legs with moderate and balanced traffic in all directions — eliminates most conflict points
Very high traffic volume > 8000 PCU/h
Signals are preferred over rotaries always
Correct Answer
B. Multiple legs with moderate and balanced traffic in all directions — eliminates most conflict points
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Rotary (roundabout): at-grade intersection without signals, vehicles circulate one-way around central island. Preferred when: 4 or more legs, moderate traffic volume (< 4000–5000 PCU/h total), turning movements are heavy in all directions, 24-hour operation without peak dominance. Removes conflict points (from 32 for 4-way to 8). Capacity limit for heavy traffic.
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