What restriction does sign E3 place on vehicles?

The sign E3 is specifically designed to indicate that only authorized vehicles may enter a certain area. This means that any vehicle that does not have the necessary permissions or authority is prohibited from entering that space. The intention behind such a sign is to ensure safety, privacy, or restricted access to particular zones, such as government buildings, private properties, or restricted work sites.

In contrast, other signs might indicate a total prohibition of entry, special allowances for some types of vehicles, or unrestricted access for all vehicles. The E3 sign distinctly communicates the need for authorization, making it clear that access is limited and regulated. Understanding this signage is crucial for respecting traffic regulations and maintaining order in areas where access is restricted.