(24 Feb 2022, 12:25 pm)Rob44 wrote thats the one...... just relying on the driver changing it to the correct sideI'm sure that was used as the reason they originally got rid of the side and rear number blinds too.
Drivers forgetting or refusing to change them
Edit: found an example of one on a preserved Metrobus https://www.flickr.com/photos/27204054@N07/4577907721/