The elderly driver became confused when driving on a large roundabout, and took an exit that put him miles out of his way.
The junction is controlled by a roundabout.
I've been roundabout for some time now.
The preposition in this sentence is "around," as it shows the relationship between the action of driving and the roundabout.
1. your question 2. The roundabout spun as fast as it could 3. The Sat-Nav told me to turn at the next roundabout 4. My feelings are a bit like a roundabout, sometimes fast and sometimes slow
Almost or roundabout
A driver must always look to the left and yield to a vehicle that is already in the roundabout.
Cars in the roundabout have the right of way over cars entering the roundabout.
The Magic Roundabout was created in 1964.
The Magic Roundabout ended in 1971.
Operation Roundabout happened in 1943.
Rhondda Roundabout was created in 1934.
A bicycle roundabout is a roundabout intended for bicycles, typically used in order to improve the flow of automobile transport.