PH - BQA 28 May 2014, 4:51 pm #449 PH - BQA PH - BQA PH - BQA Posts: 4353 Threads: 22 Joined: Apr 2014 Reputation: 0 RE: Arriva North East - Latest (28 May 2014, 4:39 pm)G-CPTN wrote I would hazard a guess that it's to improve the demisting flow to the driver's side. When wet passengers get on there's a lot of moisture to cope with.On the upstairs??