• I've never driven a lorry before, but I gather that he didn't really feel it, if he did, then he'd think it's just the road a little bumpy.

    Most big modern lorry cabs ride on their own suspension, separated from the movement of the chassis. Some of them are really soft - they sort of float about up there. I can imagine that you might not feel it. Slippery wet roads, too - and there might not have been that much of an impact anyway. It could have happened at very low speed in heavy traffic when the HGV driver was looking off into the distance forward at lights, signs or whatever.
    Is there a driver in the car? Horn not working? No-one around them on the road thought to honk or flash lights? No oncoming HGV flashing?

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