When driving through London seeing parked vans with their hazards on and not knowing if they are parked or pulling out (because I could only see the outside lights due to parked cars) -- I thought that all cars / vans should have double hazards / indicators so that when indicating both upper and lower flashed as one but when operated as a hazard warning they alternated......Never did present that to anyone so if any manufacturers like the idea feel free ... just make a donation to my favourite charity ........................ME..