Roundabout signs. - Imagos
Does anybody have an answer to this question?

Why does the circle on roundabout signs have a gap in it?

zrimsek.com/images/Roundabout_Sign1.jpg
Roundabout signs. - frazerjp
I thinks its so drivers dont get confused when they go round or something?

Maybe because that part of the roundabout is not relevent to where you're going maybe?
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Its not what you drive, its how you drive it! :-)
Roundabout signs. - Robin Reliant
It's to show that you are not permitted to turn in that direction as you enter the roundabout. The gap is always immediatly to the right of your approach road.
Roundabout signs. - NowWheels
because you ain't supposed to do a complete circle?
Roundabout signs. - Welliesorter
because you ain't supposed to do a complete circle?


Why not? On some roads there's no alternative. What if you wanted to change direction on a dual carriageway? I'd have thought the only reason not to do a complete circle would be on a very small roundabout, where the turning circle of your vehicle would prevent it.
Roundabout signs. - Dwight Van Driver
Because you read the sign as your direction of travel from the bottom upwards. Not envisaged that you would do a full circle so the missing piece occurs after the last exit you could take on a normal journey.

Nothing to stop you from doing the full circle if lost etc but this requires extra care.

DVD
Roundabout signs. - Altea Ego

I passed that very sign yesterday afternoon, and will do so again tonight.
Roundabout signs. - Adam {P}
Frightening but I think it's to symbolise which way to go around a roundabout. You couldn't go anti-clockwise over the gap.

I know I know...
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Adam
Roundabout signs. - Bromptonaut
It's an intuitive hint as to where the last exit is and helps you orientate yourself.
Roundabout signs. - Cliff Pope
They could of course put arrows, like the recycling symbol,to help people who may not know that we go round clockwise in this country.