To make a u-turn, you must ensure that no cars are closer than feet in each direction.

200 feet

Explanation: Making a U turn is making a turn of 180 degrees to an opposite direction.

their are rules in making a U turn while driving and they are:

1. Make sure there is no sign prohibiting you from making a u turn.

2. There must be a U turn only sign at the point.

3. There must be a 200 feet in each direction before the U turn is made.

4. Keep the vehicle on the right side of the lane in preparation to make the U turn.