Signals, Signs and Pavement Markings · Regulatory Signs
Do Not Enter
A square sign with a white horizontal line inside a red circle means you cannot enter. You will see this sign at roadway openings you are not to enter and when traffic is one way against you. You will see them at exit ramps, in crossovers on divided roadways, and at numerous locations on one-way roads.
Important
Do Not Enter. A square sign with a white horizontal line inside a red ball means you cannot enter. You will see this sign at openings to roadways that you should not enter such as exit ramps where you would be going in the wrong direction, in crossovers on divided roadways and on one-way streets.
Learn it with your state's rules
DMV One Way teaches the whole handbook slide by slide and checks it with practice questions.