What’s the meaning of this sign?

Explanation: This sign indicates that the road is only for use by trams. As trams cannot leave their rails to manoeuvre around obstacles, you should never block tram routes. Take extra care in systems allowing motor vehicles and trams, as trams are quick and quiet, and could appear unexpectedly.

Category: Road and traffic signs (2021)

References: The Official DVSA Guide to Driving: Section 6, Highway Code: Page 107, Know Your Traffic Signs: Page 30