[Faaak]

Yes, but they take a picture of the car.

What if you car is being toed by a speeding truck (or on a trailer) ?

[Qwertystop]

Then you could dispute the ticket, and presumably the fact that it's being towed would be visible in the photo.

[moftz]

There is usually a picture of the car along with a time and date of the incident. You would just simply appeal it and say that the car is clearly on a trailer and that the truck pulling the trailer is at fault.