When something happens on the road and you're stranded or stuck, it's important you make sure people can see your vehicle. While cars and trucks come with options such as emergency flashers, sometimes those lights just don't work due to a malfunction on the vehicle. That's when you have to deploy your emergency kit, which should consist of reflectors and emergency flares.
If your car breaks down in the middle of the day, all you have to do is get it off the road and to the breakdown lane. If your breakdown happens at night, however, there's a whole new set of dangers. In order to make sure that other drivers can see you, it's a good idea to make sure you set out emergency road reflectors.