3 ms·

All anecdotal but hey: The roundabouts I've seen fail (we have many) are those with not enough and too much obstruction. The versions with some form of gradual

by consp 4y ago

All anecdotal but hey: The roundabouts I've seen fail (we have many) are those with not enough and too much obstruction. The versions with some form of gradual grace (curved edges around a center platform or lots of grass and a bump) tend to work best. One of the worst ones was a very large one with a meter high round wall as center barrier which caused lots of damage to those who made a mistake. The too small ones are just intersections with minor obstacles to navigate.

giantg2 4y ago
Tall stuff impedes vision. The gental slope around tends to be accommodating for tractor trailers. Short stuff, even just a regular curb inside of the sloped area should be enough to stop cars from driving through it. Some short flowers or plants can help draw attention.
- landemva 4y ago
  You want to impede vision across so people focus on what is important for their merge.
  - giantg2 4y ago
    That's only potentially true with very large circles. Small round abouts are so small that you want to be able to see obstacles before you even get to the point of preparing merging.