Fake driveway spikes

I knew someone who lived in a house with a driveway that was very popular with drivers who used it to turn around. He didn't mind people doing it in the day, but it also happened all night and he hated the cars' headlights beaming through his windows. He fantasized about covering his driveway with spikes like these but wisely never acted out on that fantasy. He would have loved DrivewaySpikes ($40 on Amazon), which are rubber spikes that act as a visual deterrent to would-be driveway encroachers.