Is your point that all handicapped people need cars to get around in bad weather? I understand not everyone lives somewhere with good weather, but I'll point you to look at cities that get a ton of weather and still manage to have good transportation like Montreal, Toronto, Chicago, Tokyo, etc. and many handicapped people make great use of the transportation in those cities.
Physical and mental ability exists in a spectrum for all of us. A small portion of people may physically need to be driven around in a vehicle. But a huge portion of those with disabilities are still fully able to get onto a lightrail, metro, etc. to get around.
So, and I guess I will belabor the point, not all disabilities work the way you think.
I am freely mobile. But ... I have an extreme photosensitivity disorder. (At this point someone is going to make sunscreen noises and I sigh) There's a lot of us out there and we basically need to be under something to get around without accumulating more damage. During the night, I am completely free. During the day, I am wrapped up like the Invisible Man, scampering from one shadow to another, with layers and layers of protection. If I didn't have a car (with a special film covering the windshield, technically illegal), I don't know how I would get around.
Physical and mental ability exists in a spectrum for all of us. A small portion of people may physically need to be driven around in a vehicle. But a huge portion of those with disabilities are still fully able to get onto a lightrail, metro, etc. to get around.