Official MUTCD D3-1 Street Name Signs

Upgrade your community's navigation with Federal MUTCD Compliant Street Name Signs. We manufacture professional-grade signs for municipalities, private developments, and HOAs. Available in all standard color combinations (Green/White, Blue/White, Brown/White) with High Intensity Prismatic (HIP) reflectivity to ensure nighttime visibility. Customize with your specific street names, block numbers, and city logos.
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MUTCD Lettering & Sizing Standards

Legibility is determined by the speed of traffic. The faster cars move, the larger the text must be to allow for reaction time.

  • Standard Roads (Speed Limit ≤ 40 MPH): The primary street name must use 6-inch initial uppercase letters and 4.5-inch lowercase letters. This requires a 9-inch tall sign blade.
  • High-Speed Roads (Speed Limit > 40 MPH): For multi-lane arterials, letter height increases to 8-inch uppercase and 6-inch lowercase. This requires a 12-inch tall sign blade.
  • Title Case Mandatory: Per MUTCD Section 2D.43, street names must use mixed-case letters (e.g., "Main St"), not all uppercase. Mixed-case text is proven to be recognized faster by the human eye.

This is a fantastic collection to work on. Street Name Signs (also known as D3-1 signs in the MUTCD) are a high-volume B2B category. Your customers are municipalities, developers, and HOAs who need to replace faded signs or outfitting a new neighborhood.

The key here is to establish trust that you know the regulations regarding reflectivity, letter height, and prefixes/suffixes.

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Official MUTCD D3-1 Street Name Signs

Upgrade your community's navigation with Federal MUTCD Compliant Street Name Signs. We manufacture professional-grade signs for municipalities, private developments, and HOAs. Available in all standard color combinations (Green/White, Blue/White, Brown/White) with High Intensity Prismatic (HIP) reflectivity to ensure nighttime visibility. Customize with your specific street names, block numbers, and city logos.

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The Ultimate Guide to Street Name Sign Standards

A street name sign is more than just a label; it is a critical navigation tool for emergency responders and the public. To ensure legibility and legal compliance, all street signs on public right-of-ways must adhere to the Manual on Uniform Traffic Control Devices (MUTCD) Section 2D.43.

Letter Height & Legibility Rules

The most common mistake is using letters that are too small to be read at the posted speed limit.

  • Standard Roads (≤ 40 MPH): The primary street name must have initial upper-case letters at least 6 inches high and lower-case letters at least 4.5 inches high.
  • High-Speed Roads (> 40 MPH): For multi-lane arterials, the letter height must increase to 8 inches (upper-case) to allow drivers time to read and react.
  • Supplementary Text: Prefixes (e.g., N, S, E, W) and suffixes (e.g., ST, AVE, RD) are typically smaller, usually 3 to 4 inches high.

Color Codes & Reflectivity

While Green with White text is the universal standard, color can denote ownership.

  • Public Roads: Green background with White legend is the federal standard.
  • Private Roads: Many municipalities mandate Blue or Brown backgrounds to indicate to police and fire departments that the road is privately maintained (e.g., an HOA or apartment complex).
  • Reflectivity Grade: The FHWA requires a minimum of High Intensity Prismatic (Type IV) sheeting for all street name signs to ensure they are visible in headlights at night.

Blade Sizes & Hardware

The length of the sign blade depends on the length of the street name.

  • Standard Heights: Sign blades are typically 9 inches tall for 6" letters and 12 inches tall for 8" letters.
  • Variable Lengths: Blades range from 24 inches to 48 inches wide. We automatically size the blade to fit your text.
  • Mounting Hardware: Street blades are typically mounted using Cap brackets (for round posts) or Wing brackets (for U-channel posts). They are rarely bolted directly through the face.

Frequently Asked Questions

Common questions regarding MUTCD compliance, installation standards, and material specifications for regulatory signage.
Can I use all capital letters on my street sign?

According to the MUTCD, the answer is No for public roadways. The standard is Title Case (an initial upper-case letter followed by lower-case letters). Studies have proven that mixed-case text is significantly easier for drivers to read and recognize quickly than ALL CAPS.
Do I need to include the "Block Number" on the sign?

While not strictly mandatory by federal code, adding the Block Number (e.g., "500 BLOCK") in smaller text at the top right of the sign is highly recommended for urban areas. It greatly aids navigation for delivery drivers and emergency services locating specific addresses.
What is the difference between a "Flat" and an "Extruded" blade?

  • Flat Blade: A standard .080" aluminum rectangle. Best for smaller signs in low-wind areas.
  • Extruded Blade: Has thick, reinforced top and bottom edges that create a structural frame. This is the industry standard for wider signs (36"+) as it prevents bending in high winds and provides a stronger mounting point for brackets.

Need specific code assistance?

If your project requires a specific State DOT certification or a specialized variation not listed here, please contact our Compliance Support Team for a custom specification sheet.