Cars DO suffer from carb ice.
I used to own a Fiat 126 which, on cold dark foggy nights, would suffer engine failure on the motorways of the midlands. Even with fully open induction passageways it could barely do 60 mph so it was easy enough to declutch and freewheel onto the hard shoulder. After a 5minute wait the engine's heat would have defrosted the carb and the beast could be restarted and the journey continued for another 10 miles after which the whole proceedure would need to be repeated.
It was fitted with a flap valve to enable selection of an alternate source of induction air that was collected from around the exhaust manifolds. The owners manual advised switching to hot air in the autumn. This wasn't always enough heating to cope in severe icing conditions and the ducting (made from wire re-inforced paper) would frequently have fallen off over the summer months in time for the first chill autumn evening.
Funny how it seems almost quaint now....