Safe Driving?

Here is a test question which was sent to me by a highway patrolman. Try to answer it as best you can. Take your time and do your best.

You are driving in a car at a constant speed. On your left side is a 'drop off' (The ground is 18-20 inches below the level you are traveling on), and on your right side is a fire engine traveling at the same speed as you. In front of you is a galloping horse which is the same size as your car and you cannot over take it. Behind you is another galloping horse. Both horses are traveling at the same speed as you. What must you do to safely get out of this highly dangerous situation?

Next week I will post the answer in comments if no one gets it correct.
Highway Patrolmen are not eligible to participate.