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Why do drivers pull out from slip roads regardless of traffic?

People appear to think they have the right to join a trunk road or motorway from a slip road by just putting on their indicator and pulling out into the stream of traffic regardless of a vehicle being on the inner lane, causing that vehicle to brake or swerve out the next lane. If this happened on a regular road or somebody pulled out in front of you it would be considered as "cutting up". Why is it not in this case?

Asked on 28 December 2013 by JS, Plymouth

Answered by Honest John
The simple answer to this is to anticipate the needs of the vehicles on the slip road and give way to them. Because of the angles involved, you can see them far more easily than they can see you. That is what driving with due consideration for other road users is about. If you had anticipated their needs you would not have had to brake.
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