California Vehicle Code 22102 says it is an offense if a person makes a U-turn in a business district. There are two exceptions to this general rule. A motorist can make a U-turn if he/she: is at an intersection that does not prohibit one, or is on a divided highway and is turning at an opening that allows a turn. A “business district” is different than a residence district. It is defined as: an area where at least 50 percent of the property bordering the street is occupied by businesses, and a driver can access them from the road.