Speed Control Signs

A regulatory Speed Limit sign (R2-1) is a white rectangle with black numbers, setting the maximum legal speed, and going over it is a violation. An advisory speed sign is yellow and recommends a safe speed for a specific spot like a curve.

Radar and electronic speed signs use the Doppler effect. A radar sensor sends out waves that bounce off the approaching vehicle, and the shift in the returned frequency tells the sign the car's speed, updating many times a second. The LED solar speed limit sign then displays the number to the driver in real time.

Yes. Federal studies find driver feedback signs cut speeds by roughly 2 to 7 mph, with the biggest effect on rural curves, in school zones, and in work zones, because drivers self-correct when they see their own speed. Solar power makes them practical almost anywhere, since there's no need to trench in electrical service.

Yes, speed humps and signs are strongest when used together. Physical devices like speed humps and bumps force drivers to slow, while a Speed Bump warning sign keeps them from hitting the device at speed and a posted limit or feedback display reinforces the number. For a persistent problem, pair a limit, a calming-device warning, and a radar sign.

Start with a posted Speed Limit sign at the neighborhood's limit, add Slow — Kids at Play signs near parks and play areas, and put a radar feedback or LED speed limit sign on the street where drivers speed most. On a public street, the city sets the limit; on a private road or HOA, you can post your own custom sign.

Yes. Trailer-mounted and solar LED speed signs can be moved between work zones and problem spots, and static Slow Down and speed limit signs come in roll-up and quick-mount formats for temporary setups.

Yes. A custom speed limit sign lets you set the MPH and add your property or community name. For a large municipal or HOA order, or an electronic sign quote, call our sales team at 888-343-3771 (Mon – Fri, 8:00 am to 7:00 pm EST) or email customerservice@smartsign.com.