At red lights, stop where motorists can see you, and beware of drivers who don't use their directional signals.
Be very careful around wide trucks and busses.
Opening car doors can send you flying into traffic. Keep away from the sides of stopped cars.
Bike lights can improve your visibility during the day. After dark, a white front light, rear reflector or taillight, and reflectors on ankles or pedals are required by law. Lights with 150 lumens or more will also help you see.
Bright yellow-green and/or reflective clothing will also make you more visible to motorists. Reflective tape on clothing is especially valuable at night.