How to Navigate a Roundabout. When you encounter a roundabout on a road, the best advice is the British adage to “keep calm and carry on." The new versions of these circular intersections first emerged in 1966 in the United Kingdom, when English engineer Frank Blackmore, then age 50, had the idea to require vehicles entering the circle to ... More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.