Official MUTCD Speed Limit Signs

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With &#;3Ms 10-year warranty&#;, we mean that all our aluminum and reflective aluminum signs will be free from defects in materials and workmanship for ten years from the date of purchase. This warranty is provided by 3M, the pioneer in reflective films, inks, and laminates.

However, there are some exceptions to this claim. The limited warranty does not apply where the defect is:

• Due to a typographical error, whether on stock products or custom products;
• Due to goods being used or handled in a manner, in circumstances, or for purposes other than those approved or instructed by SmartSign;
• Due to modification, tampering, improper storage, abuse, accident, vandalism, neglect, misuse, mishandling, or pressure-washing;
• Due to fire, earthquake, flood, lightning, hurricane, tornado, windstorm, foreign object impact, landslide, or any other Act of God;
• Due to damage caused by vegetation, insects, animals, and other organisms.
• Due to exposure to corrosive substances such as solvents, gasoline, pesticides, harmful cleaning compounds, and similar materials.
• Due to exposure to excessive heat or reflective heat sources.

See our terms for more details on the warranty.

Besides the snow-covered roads&#;a very clear reason but only applicable in a small number of cases&#;there are several vision-related explanations.

Contact us to discuss your requirements of speed limit sign for sale. Our experienced sales team can help you identify the options that best suit your needs.

The first one is simply geometrical. On an empty road, a traffic sign remains for a long time close to the centre of the driver's field of view (where vision is sharpest) and can be seen from far away. It gets off the centre but at the same time bigger and more clear as the car approaches. It can even be well visible at a slightly curved road. A painted sign would only be visible when you are close to it, giving you less time to react.

Another reason is optical. Although a road pavement is rough, at grazing incidence (i.e. when you are looking almost parallel to its surface) it becomes highly reflective (you can experiment at home by holding a dark-covered book perpendicular to the window and looking parallel to the book). Light from the sky is therefore well reflected by the road surface, making the painting practically invisible. The effect is even worse if the road is wet.

Then, imagine a situation when information to be provided is more than just one number of the speed limit. Multiple signs or an extended text can be easily mounted on a single pole and would occupy a relatively small area. The same information positioned on the road surface would require 1/sin(a) more space, a being the angle between the road and the line of sight. It makes the painted signs huge and increases the probability that at least part of it will be obscured by other cars. Therefore large signs need to be positioned on the poles. And since some of the signs are already there, drivers are used to that position, making it optimal for smaller signs too.

Finally, traffic signs are more effective with headlights. A traffic sign is positioned almost perpendicular to the headlight beam and thus optimally reflects light back to the driver. To the contrary, the road surface is oriented almost parallel to the headlight beam and reflects back very little light. A simple paint therefore would be barely visible at night. One could use a retroreflecting paint, but it only became available recently and is rather expensive to be constantly replaced.

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