Road signs, Trams
What does a triangle showing a tram mean?
Trams operate or cross ahead.

A red-bordered triangle showing a tram.
What you must do
Watch for trams, give way as required, and take care crossing the rails, especially on a motorcycle or bicycle.
Where you will see it
In towns and cities with a tram network.
Test yourself
The theory test asks you to recognise signs like this one. Try the road and traffic signs short test (with an easy and a hard set), or read the signs revision notes. Source: Know Your Traffic Signs.
Other common road signs
Meaning based on Know Your Traffic Signs and The Highway Code. The sign image is an official Department for Transport sign (Crown copyright) from Wikimedia Commons, reused under the Open Government Licence or the public domain. Always check the current Highway Code on gov.uk. Not affiliated with or endorsed by the DVSA.