BCFC -
Car engines certainly _can_ get carb icing but it's rare. Almost every petrol car since the widespread adoption of catalytic converters in about 1989 is fuel injected and uses a water-heated inlet manifold, which effectively eliminates the problem. Back in the '70s and earlier, in the days of the rear-drive Escort and Chevette, you often had a dual position intake nossle leading to the air cleaner, which breathed either cold ram air or (by manual adjustment) from a warm position behind the radiator.
I used to get carb icing years ago on my 1983 1300 cc carb-fed Fiat Uno. At that time there was a thermostatic flap operated by a bi-metallic strip which was supposed to blend in air between the hot and cold sources. The strip packed up and the carb would ice up a treat - classic aviation symptoms. I had to tell the Fiat dealer what to fix (it was under warranty) 'cos they didn't have a clue what carb icing was.
Good thread - by habit I'm a five-minute man myself, but with my skills test coming up soon I shall now be applying carb heat for longer periods (30 sec rather than 15 sec) during those checks. And I'd love to fly behind a nice modern turbo diesel running on jet fuel.