To continue ~ The larger "road worthy" scooters can travel up to 8mph .... these must be equipped with lights (fore and aft), a warning horn, indicators and have to be insured for use on the road. They may not be driven at more than 4mph on the pavement and usually have a switch to govern their speed when "off road".
Getting back to the "cloak of invisibility" I have been accused of driving into people when in fact they have tripped over me from the side. Now it is possible for me to drive the thing forward and back but not sideways so when some idiot topples into my lap I think it fair to say "Look where you're going". Without fail "I didn't see you" is their excuse. I am not easily missed, I am a large bloke, sitting on a blue mobility scooter that is 3 feet high and 3.6" long but because I am not at eye level it seems I don't exist!
BTW Kiddies love the little beep-beep noise and often ask if they can "Have a go" .... their mothers drag them away as tho' I am some kind of infectious monster.

And on the subject of disability why oh why do the doors granting disabled access by means of a push button always open outwards into my face, knocking me back down the fvcking ramp? Council Offices are the worst offenders!