i Register
In some senses, roundabout is marked as UK, US, British. Watch for register when choosing this word.
VERB + ROUNDABOUT
enter
get off, leave
You need to get off the roundabout before the traffic lights.
drive/go around/round
PREP
at the ~
When you reach the roundabout, take the second exit toward the shopping center.
on the ~
Cars were waiting on the roundabout for several minutes during rush hour.