I wouldn't be afraid of rabid dogs and madmen, but I will pass on this story of my mate's solo night ride up Cwmcarn a couple of days ago…
Took his single speed up for the first time, and had trouble with the chain coming off on the steeper bits, so after hitting his balls on the stem for the 3rd time, he took to the road. Back on the track (after the concrete slope) his chain gets caught up and completely wedged between the front sprocket and the frame, and wont budge. So, he abandons ride, gets back to the road and free wheels down. Going pretty fast, decides his light should be on full, instead of low, so cycles the switch though flashing, then off, then… shit it won't come back on again! Pitch black, going about 25mph, panics, slams on the front brake with one hand in the bars, and goes straight over the front wheel. Returns to the car battered and bruised. Moral of the story, apart from don't be a tit and slam your front break on with one hand, is solo night riding can be hazardous if things go wrong!