55 MPH signs are standard for many state highways, rural routes, and sections of interstates located near urban boundaries. They are also frequently used as the "statutory" or default limit for unmarked rural roads in many states. You can find compliant versions on our 55 MPH signs page.
Because 55 MPH implies faster vehicle speeds and shorter reaction times, Diamond Grade reflective sheeting is highly recommended for maximum night visibility. While High Intensity Prismatic (HIP) is the minimum for many DOT projects, Diamond Grade provides up to 1,500 feet of visibility, which is essential for safety at highway speeds. This is the same grade used for high-performance custom highway signs.
The standard speed limit sign code is **R2-1**. The 55 MPH version follows specific height and width ratios for the numbers to ensure legibility at speed. For multi-lane roads, a larger 30" x 36" or even 48" x 60" size may be required to meet MUTCD speed limit sign standards.
According to MUTCD Section 2A.18, on rural highways, the bottom of the sign should be at least 5 feet above the level of the pavement. In business, commercial, or residential districts where parking or pedestrian movement occurs, it must be mounted at least 7 feet high. Secure these at the correct height using our street sign brackets.
Yes, split speed limit signs (e.g., "Day 65 / Night 55") are available for specific state regulations where lower night speeds are enforced. These fall under the MUTCD R2-1 series for regulatory signage and help reduce accidents during low-visibility hours.
Our 50 MPH & 55 MPH Speed Limit Signs are designed for roadways where higher travel speeds are permitted, including highways, rural roads, arterial streets, and controlled traffic environments. These signs help clearly communicate posted speed limits and support safe, consistent traffic flow.
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