Traffic signs with a circular, rectangular or square shape and a blue background and white pattern are

Indicator signs.

Indicator signs are one of the main signs in traffic signs. Used to instruct vehicles and pedestrians to drive in the specified direction and location. The color of the indicator sign is blue background and white pattern; the shape is divided into circle, rectangle and square.

The sign indicates that all vehicles are only allowed to turn left (or right). Located at an appropriate location before an intersection where vehicles must turn left (or right). When there are special regulations such as time, vehicle type, etc., auxiliary signs or additional patterns should be used.

Extended information:

Road traffic signs are facilities that use graphic symbols, colors and text to convey specific information and are used to manage traffic.

Road traffic signs play a role in ensuring smooth roads and driving safety, so drivers and traffic participants must abide by them; traffic safety slogans can improve drivers and traffic participants' conscious compliance with traffic laws. awareness is of great significance to building a safe and smooth traffic environment.

However, if traffic signs and slogans are not set up in a standardized manner, or if their content violates traffic regulations, they will surely mislead traffic participants, thereby posing hidden dangers to traffic safety.