Parking regulatory signs are usually what shape?

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Parking rules signs are treated as regulatory messages, so their shape and look are chosen to signal a rule you must follow. They use a vertical white rectangle with black lettering because the high contrast and simple, upright format make the text easy to read quickly, even from a distance or at a glance. This consistency helps drivers recognize that the sign is stating a law or restriction about parking, not a warning or directional guidance. Other sign shapes convey different kinds of information: warning signs are typically diamond-shaped to grab attention about hazards, while some informational or mandatory signs use other shapes or colors. So the vertical white rectangle is the standard for parking restrictions because it clearly communicates a binding rule.