Roundabout could be in different shape yet performing its function, its not necessarily circular before it performs it function. They are usually safer and more effective than normal circle.
Round about has a counterclockwise flow to allow traffic or vehicle moves in order to reduce traffic
It must have an Entry Yield control for vehicles to align and move during hold up
It must have a curve shape that allows vehicles to slow down there speed to about 15-25MPH when close to it to avoid clash of vehicle.
