If you see a downed power line
Power lines knocked down by blizzards, high winds and vehicle accidents can be deadly. If you see a downed power line, make others in the area aware of the situation and call your local power company immediately to report the problem.
Assume fallen wires are "live" and dangerous. Do NOT touch anything that may be in contact with the downed wire.
If a wire falls on your car and you're in the vehicle, stay inside the vehicle if possible. If you must get out of the vehicle, jump clear of the car with both feet together. If one foot is in the energized car and the other foot is in contact with the ground, your body will act as a conductor of electricity which can cause injury or death. In addition, contact with overhead wires, or an object touching the line, can also cause serious injury or death.
For more detailed instructions on what to do if you see downed power lines, check out this document.