If you have a driver's license, you should know the basic rules of the road. Buckle your seat belt. Use your turn signal. Stop at the red light.

But there may be scenarios on the road that you feel less prepared for. What should you do if your car starts to skid on ice? If someone is being aggressive toward you on the highway? If your car falls into a body of water?

Hector Carias, an officer with the California Highway Patrol, explains what to do in these emergency situations. The key is to stay vigilant, he says. "Driving should take 100 percent of your concentration, 100 percent of the time. Being defensive behind the vehicle can only bring positive outcomes."

Motor vehicle crashes are a leading cause of death in the United States, killing more than 120 people everyday, according to 2

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