Orange signs on the highway indicate:

Orange is reserved for construction and work zones. Orange signs warn of upcoming work areas, lane closures, detours, flaggers, and reduced speed limits. Orange traffic cones and barrels mark the work area itself. Drivers must slow down, follow posted detours, watch for workers, and obey flaggers' direction. Most states impose doubled fines for speeding in work zones, and some have specific penalties for ignoring flaggers or striking workers. Work zones are dangerous because lane geometries change frequently, workers are vulnerable, and other drivers may be unfamiliar with the changed road. Approach every work zone as if anything could happen.