I primarily ride alone, but the single track I ride on is a County owned park and they lock the gates at sunset. I hope that if they see a vehicle with a bike rack in the parking lot that they would go looking for the person. I carry a cell phone with me in case I hurt myself and need to call for help. I have a small LED flashnight if I get stranded after sunset.

If your worried about it, tell a friend or family member that your going riding alone and that you'll call them at a specific time after your ride is over just to make sure that you made it back ok. If they don't hear from you, then they should come looking for your carcus.