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What the MUTCD requires
Section 2B.21 of the MUTCD sets placement conditions, not a universal distance between signs. It says: “Speed Limit (R2-1) signs, indicating speed limits for which posting is required by law, shall be located at the points of change from one speed limit to another.” The MUTCD, 11th Edition with Revision 1, also calls for a sign at the downstream end of a speed-limit section showing the next limit, plus additional signs beyond major intersections and elsewhere when needed as reminders.
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- At a zone change: the sign marks where a different posted speed limit begins.
- At the downstream end: a sign displays the next speed limit.
- Beyond major intersections or where a reminder is needed: the agency may install additional signs based on the road and driving context.
Those triggers do not translate into a standard spacing such as every half-mile. Sign placement is not governed by a blanket repeat interval in the federal manual.
Why the answer can differ by state and road
The MUTCD establishes national traffic-control-device standards, but state and local agencies set speed limits under their authority. A state may adopt its own manual or supplement, and local road authorities may have additional requirements. FHWA identifies the MUTCD 11th Edition with Revision 1, dated December 2025, as the current national edition. For example, Caltrans says the California MUTCD 2026 took effect January 18, 2026, and is in substantial conformance with the 2023 national MUTCD.
#1 Best Overall
- Size: 18 X 12 inches.
- Includes: Each package includes 2 Speed Limit 5 MPH Sign, excluding attachment accessories such as screws, zip ties, nails ect.
- Easy to Install: It comes with 2 pre-drilled holes at the top and bottom for easy installation.
- High Quality: We use Engineer Grade Reflective Sheeting Heavy Duty Rust Free .040 Aluminum materials to manufacture our signs. It is corrosion preventing, UV protected, waterproof, weatherproof, non-fading and reflective. Outdoor service life up to 10 years.
- Visible Warning: Our Speed Limit 5 MPH Sign are bright and easy to spot.
Road context can also affect whether reminder signs are useful. FHWA lists factors considered in speed studies such as road type and features, traffic volume and motorist speeds, road setting, intersection and driveway spacing, sight distance, parking, pedestrian and bicyclist activity, crash history, and pavement condition. These are relevant to speed-limit decisions and roadway context; they are not a formula for calculating sign-to-sign distance.
A missing sign does not necessarily mean there is no speed limit
Statutory limits may apply even where a speed-limit sign is absent. The applicable limit depends on state law and road class, so the distance between posted signs alone does not establish the legal speed. FHWA explains that statutory limits apply without a sign and that posted limits may be adopted by a city, county, or state agency after an engineering speed study. FHWA’s Speed Limit Basics describes these distinctions.
Rank #2
- Size: 18 X 12 inches.
- Includes: Each package includes 2 Speed Limit 5 MPH Sign, excluding attachment accessories such as screws, zip ties, nails ect.
- Easy to Install: It comes with 2 pre-drilled holes at the top and bottom for easy installation.
- High Quality: We use Engineer Grade Reflective Sheeting Heavy Duty Rust Free .040 Aluminum materials to manufacture our signs. It is corrosion preventing, UV protected, waterproof, weatherproof, non-fading and reflective. Outdoor service life up to 10 years.
- Visible Warning: Our Speed Limit 5 MPH Sign are bright and easy to spot.
School-zone, work-zone, variable, and advisory speeds are separate cases with their own applicable provisions. Do not assume the ordinary permanent-zone placement rules settle how signs for those situations must be placed.
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- Identify the state and the road authority responsible for the road, such as a state department of transportation, county, or city.
- Check that jurisdiction’s current MUTCD edition, supplement, and any applicable local requirements for speed-limit signs.
- Determine whether the sign marks a limit change, identifies the next limit at a zone’s end, or serves as a reminder after an intersection or elsewhere.
- If the question is whether a sign is legally placed or a limit applies, contact the road authority or consult the relevant state law; spacing alone is not enough to decide.
This is a general U.S. explanation, not a determination about a particular sign or road. The controlling rules depend on jurisdiction and the type of speed limit involved.
Quick Recap
Best Value
- Bright and alarming black-and-white "Speed Limit 15 MPH" sign will help remind the drivers that they need to slow down on driveway.
- 18 x 12 inches, made of sturdy and strong Engineer Grade Reflective Sheeting, Rust Free Aluminum.
- Our Heavy-duty rustproof aluminum signs can withstand inclement weather without fading. Outdoor service life up to 10 years.
- Our sign has 2 pre-drilled holes at the top and bottom for easy mounting on every surface including walls, fence，poles and gates. No need for adhesive or special equipment.
- Reflective signs illuminate when struck by light from headlights or any other source and is hard to ignore. This makes the message readable even in the dark .
Rank #4
- The Wordings will withstand the elements and will not fade,no matter the rain,sun,or other extreme weather.
- The aluminum material is durable,and will stay good as new even after many years of indoor or outdoor use.
- Easy to install and a solid overall sign.You will like how reflective it is.
- Perfect size,not particularly large but clear and easy to see.
- Specifications:17 x 12 inches,made of strong rust-free 40 mil aluminum; Durable heavy aluminum sign.
Rank #3
- Dimensions: Speed Limit 5MPH Sign measures 12" x 18" for enhanced visibility and safety
- Easy Installation: Each Slow Down Sign comes with pri-drilled holes, Designed for hassle-free mounting on walls, posts, or other surfaces
- Durable Construction: This 12" x 18" Slow Down Speed Limit 5MPH Sign is made of heavy-duty, rust-free reflective aluminum for long-lasting outdoor use
- High Visibility: This 12" x 18" speed limit sign features bold black text on a bright red background for maximum visibility and safety, alert drivers and pedestrians
- Versatile Usage: Suitable for residential areas, parking lots, school zones, and other low-speed zones
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