A sign regulates or controls the movement of traffic A identifies roadways and routes and points out roadside services. A alerts you to changes in the condition or use of the roadway ahead. signs tell you where you are, which lane to take to get to your destination, what exits are coming up, and how far the exits are. A is located where railroad tracks cross the roadway. identify which route you are driving on. ,,, and are examples of common regulatory signs.