[saiya-jin]

This is not the best design, you can still go full speed through it. Much better ones actually force you to slow down, ie sub 30kmh otherwise your suspension, tires etc will get hammered a bit (or more). There are numerous ways how to do it, ie central island is wide, island's walls are high and steep, you can have speed bumps before it etc. Its has been done elsewhere and it works.

[egberts1]

Already done.

A car leaps 7 meters into the air across the roundabout.

https://m.youtube.com/watch?v=aniguxnz9ik

[terramex]

Important to mention that driver was drunk out of his mind (2.8‰ BAC)

[saiya-jin]

So it worked, weeded out dangerous driver before it can kill bunch of kids crossing the road on pedestrian crossing. Generally it really works, I mean 100% of the cases where I live. Everybody slows down, normal cars, sports cars, motobikes etc. If you don't, you suffer for your own ignorance.

[rootusrootus]

Indeed, with even a halfway decent sports car, a roundabout isn't a traffic calming measure, it's a little bit of excitement. If you want to slow traffic down, put in an Indian style speed bump. Though in the US you'd probably have vandals taking it a jackhammer to it the next day.

[oezi]

The European solution is the right-before-left rule which means you always have to yield to cars coming from your right.

In residential areas you never would have any signs because of this rule.

You can speed through it if visibility is good but it is very hard to argue you weren't at fault in case of a crash.

[Symbiote]

There's no single European solution. Only some countries have the right-before-left rule.

Britain can shrink the roundabout to just paint, or sometimes paint and a slight hump: https://www.google.com/maps/@51.4722603,-0.0655446,3a,75y,32...

Denmark prefers tight corners and narrower roads. Just one parked car and you have to slow: https://www.google.com/maps/@55.6754101,12.4699621,3a,75y,28...