I have a ding city WOLO bell that I use when lights turn green but the cars won't go. I get pedestrians attention with it when they are on the phone not paying attention, and use it when passing a car that is on the side of the road like FedEx, UPS, or USPS. I try to stop while I can still see the car's tires. Most important thing you can add to your car is a dash cam with a second camera to film behind you. I even run cameras on my latest bike. I just ordered 5 air horns for the bike. The other one has 2.