What does this traffic sign mean?

Explanation: Priority signs are normally shown where the road is narrow and there isn't enough room for two vehicles to pass. Examples are narrow bridges, roadworks and where there's a width restriction. Make sure you know who has priority; don't force your way through. Show courtesy and consideration to other road users.

Category: Road and traffic signs

References: The Official DVSA Guide to Driving: Section 6, Highway Code: Page 106, Know Your Traffic Signs: Page 18