Not really looked at Trent Barton's screens, but one I do disagree with is the new Transdev Yorkshire Coastliner displays which flick between the service number and destination and then changes to just "Coastliner" how are you supposed to tell where the service is heading if "Coastliner" is on the screen? Almost everytime one went past me when I was taking photographs in York last Saturday it would be showing "Coastliner."
Here is the screen showing Coastliner: https://flic.kr/p/FtJgfs
The same applies to the "Tadfaster" service which I saw showing "York fast" and then "Tadfaster."
PSV Accessibility Regulations (DDA Regulations) - at a glance