A. To help you choose the correct lane
B. To help you keep the correct separation distance
C. To make you aware of your speed
D. To tell you the distance to the roundabout
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These lines are often found on the approach to a roundabout or a dangerous junction. They give you extra warning to adjust your speed. Look well ahead and do this in good time.
The lines are not thick enough to be a danger to motorbikes braking unless you are braking very heavily.