DO pay for your parking tickets or traffic tickets on time, unless you plan to contest them. DO keep a winter survival kit in your car for bad weather conditions. A good survival kit should contain a cell phone, matches, flares, a working flashlight, food, water, and blankets. DO make sure that your spare tire is in your car and that you have a working jack. DO make time for routine preventative maintenance on your car.
Breakdowns can be dangerous and costly.
DO plan your route out in advance for long car trips and keep a map or atlas in the car in case you get lost. THE DON'Ts DON'T drink and drive, and don't get in a car with a driver who has been drinking or using drugs. DON'T make assumptions about what other drivers are going to do. Just because someone has their turn signal on does not mean they are actually going to turn. DON'T assume that other cars know what you are doing, either.