MUTCD mandates diamond shapes exclusively for warning signs including curves, intersections, pedestrian crossings, and hazards, with yellow backgrounds standard and orange for temporary construction warnings.
While yellow remains standard for permanent warnings, fluorescent yellow-green indicates pedestrian/bicycle/school zones, with custom colors permitted only on private property to avoid confusion with official warnings.
Diamond signs measure point-to-point across horizontal or vertical axes, with 30x30 diamonds having 21.2-inch sides and 42.4-inch diagonal measurement, requiring specific mounting brackets for 45-degree orientation.
MUTCD requires 30-inch minimum diamond signs for roadways with 35+ mph speeds, 36-inch for 45+ mph, and 48-inch for highways, with smaller sizes permitted only for low-speed private roads.
Complex warnings benefit from supplemental plaques below diamond signs specifying distance, speed, or conditions, with plaques measuring 24x18 inches standard for 30-inch diamond primary signs.
Choose the color or design which you like best. Then click on the sign to fully customize. On the next page you will be able to choose the size, font and wording of the sign. You will also be able to choose the material for your sign.
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