What color might indicate a no-parking zone?

The color red is widely recognized as a signal for prohibition or restriction, making it an effective way to indicate a no-parking zone. In traffic control, red is often associated with stop signs or stop lights, conveying the message that certain actions, such as parking, are not permitted in those designated areas. This use of color helps drivers quickly understand and comply with the regulations of roadways, ensuring safety and order. In contrast, other colors like blue and green are typically associated with different driving functionalities, such as designated parking areas or permit parking, while yellow may designate caution or limited time parking rather than outright prohibition.