Construction zone signs are orange with black lettering or symbols. This bright orange color is used for all temporary traffic control signs related to road work, construction, or maintenance.
For instance:
A sign that says “Road Work Ahead” will be orange with the words in black.
Lane closed signs, detour signs, workers present signs, flagger ahead signs – all are orange background with black text/graphics.
The use of orange is meant to grab drivers’ attention and signify that normal conditions have changed (due to construction or an incident) and that one should use caution.
Other things in construction zones are orange too (for consistency and high visibility) – like orange cones, barrels, and barricades, as well as often the safety vests worn by road workers.
So, in summary: construction zone warning and guidance signs are orange with black text/symbols. This color scheme indicates a temporary condition and usually means “Caution – you’re entering a work zone.”
