It seems to me they must be reversing in a dangerous place.
I wonder if it would be worth talking to your local traffic police. Obviously you need to be able to get on and off your drive quickly and safely .
If it were the same people constantly doing it, it would be easier to deal with but I suspect this isn't the case. At night time, park in such a way that makes it impossible for it to happen, if you can do so without obstructing your neighbour. If you are able to put spikes down without interfering with either of you, it must be possible to put some sort of post, low fence, concrete flower tub or other obstruction there.
I would be very wary of the spikes.