my main problem with the devil's arrows is trying to spot them from the car while driving. I do the same with a couple of other sites, it's not so much the road that's dangerous though, just me. They really should have thought about the locations when they built the sites - I'm all for good access, but some are daft...
Moving cars aren't the problem at Long Meg - it's the stationary ones you have to watch out for. Some yoghurt-weaving idiot was parked up right next to he circle the last time I was there. She was blathering on about how magical the stones were - but apparently not magical enough to inspire some respect.