What does a park and ride sign mean?
Directions to a park-and-ride site, where you park and take a bus into the town centre.

A rectangular sign with a bus and the words Park and Ride.
What you must do
Follow it to park on the edge of town and travel in by bus, which avoids city-centre traffic.
Where you will see it
On the approach to towns and cities with a park-and-ride scheme.
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.