These signs warn of unusual temporary conditions such as road work zones, diversions, detours, lane closures or traffic control people on the road. They are usually diamond-shaped with an orange background and black letters or symbols.
Here are some common temporary condition signs:
Construction work one kilometre ahead.
Road work ahead.
Survey crew working on the road ahead.
Traffic control person ahead. Drive slowly and watch for instructions.
You are entering a construction zone. Drive with extra caution and be prepared for a lower speed limit.
Temporary detour from normal traffic route.
Flashing lights on the arrows show the direction to follow.
Pavement has been milled or grooved. Your vehicle's stopping ability may be affected so obey the speed limit and drive with extra caution. Motorcyclists may experience reduced traction on these surfaces.
Lane ahead is closed for roadwork. Obey the speed limit and merge with traffic in the open lane.
Closed lane. Adjust speed to merge with traffic in lane indicated by arrow.
Do not pass the pilot or pace vehicle bearing this sign.
Reduce speed and be prepared to stop.
Follow detour marker until you return to regular route
Enforces doubling the HTA fines for speeding in a designated construction zone when there are workers present.