(10 Nov 2015, 5:41 pm)Andreos1 wrote No idea.
Air con? Lack of headroom?
Operator specification?
Fuel economy and aerodynamics?
Or the actual design? Manufacturers are limited on both sides of the vehicle, due to the location of the new emergency exit - which certainly won't help things.
http://www.wrightsgroup.com/Products/Str...rettyPhoto
http://www.wrightsgroup.com/Products/Str...rettyPhoto
http://www.optare.com/vehicles/
There isn't much scope at all for any additional opening windows.
I know some older vehicles had the sliding version of opening windows more or less all the way to the rear of the vehicle.
https://www.flickr.com/photos/nedbasher/...otostream/
Mind, this one was pretty limited! https://www.flickr.com/photos/nedbasher/5653036679
Just be careful if you ever head to Birmingham!
http://www.mirror.co.uk/news/uk-news/bus...es-6582853
Thise rear seats are pretty high up - your head is level with the top of the window. If the window, which is rather narrow, did open, it would be right in your face.