Ok, here's basically how i did it, bearing in mind i've had a few beers after work, and i can't really remember the details too well, and there may well be better ways to do it
Original:
Select around the car with magnetic Lasso... then right click > Layer via Copy
Then make Background layer active, then go to Filter > Blur > Radial Blur
Then you have to change to Zoom blur method, and then you have to choose the Blur centre in the box, which is the end of the road in this pic... (it's a bit trial and error with this method... there may be a better way..)
And you get this:
I think i did some more tweaking with masking etc to control the blur, but this is a good start
That's all you get on a friday night