The motion shots were accomplished with rigs
Were these "rigs" arms attached to a following vehicle, or to a vehicle traveling parallel, or a cine-type rail system...?
Other options to achieve this type of shot might be:
aircraft
panning with a long lens from a distance.
¿You achieve motion blur, typically, by moving or rotating the camera relative to the subject/background during exposure....?
If you pan from a great distance you can get the effect you might get from a parallel vehicle, but the perspective of the vehicle might be unacceptable... ,,, and the blur would increase with distance..
edit: panning will cause blur on the car, but less blur from a greater distance.Moving the camera parallel can be difficult if there is not a parallel road, rail or surface to move the camera/vehicle/rig along.
...what occurs to me is that it might be possible to achieve the blurred background by shifting the back of a digital view camera during the exposure.
edit: this would also cause some parallax blur... it would work with a co-planar subject....Hartblie use a motorized sliding back, and if this technique could cut half a day or more off the duration of the shoot,,,
...but you could achieve the same results by merging several shots, shifting a little between each, with one shot including the car
...but you would have to mask out the background in the other pix, and you would have to re-invent the blur on the wheels.
edit: It would be possible to move the camera on a robotic rail, and the car on a similar rail that took a small proportion of the weight, leaving the wheels on the ground... you might need some laser surveying equipment to set it up.