> If this is the case you can install stop lights and traffic sensing at roundabout ingress points
But those options are a lot more expensive and need a lot more maintenance than just a regular roundabout or four way stop.
> you can also provide a "turn right" lane that bypasses the roundabout entirely.
How would that work? Consider a 4-way roundabout, where there's a constant flow of cars from west to east, and one car from the south that wants to go north but can't because of the starvation problem. None of the involved cars would want to use a "turn right" lane.
Putting a stop sign or traffic light in your scenario will just cause traffic jams. If the density is low enough to allow flow with a gap created by a stop sign, without causing traffic jams, then there will also be gaps for the secondary flow.
But those options are a lot more expensive and need a lot more maintenance than just a regular roundabout or four way stop.
> you can also provide a "turn right" lane that bypasses the roundabout entirely.
How would that work? Consider a 4-way roundabout, where there's a constant flow of cars from west to east, and one car from the south that wants to go north but can't because of the starvation problem. None of the involved cars would want to use a "turn right" lane.