Here is one of the best things I've learned from BF: The human brain is hardwired to see faces (that part I knew). That's why people see Jesus in a grilled cheese sandwich. When a car is approaching from the front or side and might be on an intersecting path, turn your head to look directly at the driver. Even if the driver isn't looking for you (because he's looking for cars, not bikes), his brain might pick up on your face and he'll notice you. Sure won't prevent every crash, but it might prevent a few.