55 MPH Speed Limit Sign - Official U.S. Road Signage #1778070 (License: Personal Use)

This is a standard regulatory traffic sign used across the United States to indicate a maximum speed limit of 55 miles per hour. The sign features high-contrast black numerals and letters on a bright yellow background with a black border for optimal visibility day and night. It complies with MUTCD (Manual on Uniform Traffic Control Devices) specifications for size, font, and reflectivity.

Typically displayed along highways, rural roads, or state routes where 55 mph is the legally enforceable speed limit; used by transportation departments, driver education materials, and traffic safety campaigns to inform drivers of legal speed restrictions.