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> Some of them have a stop sign in the roundabout?

Traffic gets much heavier and we'll need stop signs at our roundabout near my house. During rush hour it has predominantly one flow of traffic and nobody slows down below 30-35 mph so getting into the roundabout can be difficult. A stop sign would defeat some of the point of a roundabout but it may become necessary to enforce safety.

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In the UK a lot of roundabouts have traffic signals for this purpose that only turn on during busy times.

How big are the roundabouts? I've read one of the problems that can be had is smaller ones, like in this picture, allow drivers to go through at high speed unimpeded. The "ideal" design seems to be to wiggle the road the opposite direction of the turning motion then force going around a decent sized center. In this way going around a roundabout quickly isn't impossible... but going 35 mph would make most feel quite uneasy. The downside is it greatly amplifies one of the biggest roundabout downsides: the amount of space needed.

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