ICBMs have the distinct advantage of being able to provide a wide scale attack with high precision and short preparation/response time. This makes it a perfect

ICBMs have the distinct advantage of being able to provide a wide scale attack with high precision and short preparation/response time. This makes it a perfect deterrent. But between the long preparation time, the chances of being discovered ahead of time, and the low relative impact/reach, even when placed strategically a few car-nukes would probably deliver more of a "terror strike" type of attack. You can cripple a few weak points but nothing "terminal".