Be seen-be visible to traffic and other cyclists. Sometimes it's hard for drivers to see bicyclists because we're smaller than cars. Do not ride at night. Have someone pick you up if you're out after dark, or walk your bike home. Don't ride too close to parked cars.
Cars can still be dangerous when they're parked.
The driver may suddenly open the door in your path, or pull out suddenly. Leave at least three feet of distance when passing parked cars, and be alert for cars that may be pulling out onto the roadway in front of you. Cars have to slow down for walkers, and so do bicycle riders. Keep your speed down when riding on a path, trail or sidewalk where you share the path with walkers and joggers. Make sure other people know you're coming, so they don't suddenly step into your path-call out to them when you are approaching or passing, so you don't surprise them.