The best replacement for roundabouts is traffic lights.

The best alternatives to roundabouts are rated as following:
★★★★★  traffic lights
★★★★★  intersections
★★★★  traffic circles
★★★  stop lights
★★  traffic signals
★  signals
★  stop signs
★  stoplights
  rotaries
  lights

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Google Trends

Scale is based on the average worldwide traffic of roundabouts in all years. Click on graph for more.
roundabouts
traffic lights
intersections