UK Driving Theory Practice Exam

A red circular sign typically indicates prohibition or a mandatory restriction for drivers. This can include no entry signs, maximum speed limits, or other regulations that restrict certain actions by road users. The use of red is significant as it draws attention and communicates that the action is not allowed.

For instance, a red circular sign may indicate that vehicles are not permitted to enter a certain area, or that a particular behavior, such as making a U-turn or overtaking, is prohibited. This strong visual cue is essential for road safety, as it helps ensure drivers comply with critical traffic rules that keep the roads safe for everyone.

Other options do not accurately reflect the core function of a red circular sign—warning signs often use yellow or amber, while informational signs are generally blue or green. Speed limits, although sometimes appearing in a rounded shape, are defined with specific numeric indications and sometimes feature additional colors. Therefore, the function of red circular signs as a mark of prohibition stands out clearly in the context of road signage.