The X-ANC/HJA/OBN Dennis Darts

[Raawwwrrr!]

RE: The X-ANC/HJA/OBN Dennis Darts
Rollerblinds and powerblinds are DDA so long as they're:

Fitted on the front of the vehicle, as close as practicable to that part of the windscreen which is within the driver’s field of vision; and on the nearside of the vehicle adjacent to the entrance which is closest to the front of the vehicle at a height of not less than 1.2m to the lower edge of the display characters and not more than 2.5m to the upper edge of the display characters measured from the ground. It also must be fitted with a route number display on the rear of the vehicle.

Route number displays should use characters of not less than 200mm in height on the front and rear of the vehicle and not less than 70mm in height on the side of the vehicle; contrast with the display background; are illuminated, and must be able to show not less than three characters.

Destination displays should use characters of not less than 125mm in height when fitted to the front of a vehicle and not less than 70mm in height when fitted to the side of a vehicle; contrast with the display background; be illuminated, and have the ability to show not less than fifteen characters. Displayed information can't be written in capital letters only.

So as long as a rollerblind/powerblind meets all the requirements then it's completely fine to do so.