the primary problem with roundabouts is their throughout. the only way to raise throughout is to increase the radius since roundabouts with more than 2 lanes do

the primary problem with roundabouts is their throughout. the only way to raise throughout is to increase the radius since roundabouts with more than 2 lanes don't really work. roundabouts are great for low speed roads with moderate congestion but as the speeds and number of cars increase, they make less sense