Sigh, so much to buy:
(1) Garmin Varia to alert me if a car is approaching; if only this device could tell whether the car is about to pass or run me over!
(2) Apple Watch with fall detection to alert my emergency contact and emergency services if #1 does not prevent someone from running me over.
(3) Front and rear cameras so that I (or my estate) can recover from the negligent or reckless driver who ran me over.
Total all three and it's more than what some people spend on their wheels.