Flagger Ahead Sign
The flagger ahead sign warns that a traffic control person (flagger) is directing traffic ahead in or near a construction zone. Drivers must obey all flagger directions, which have the same legal authority as traffic signals.
Last updated: April 4, 2026
A flagger is an authorized person who controls the movement of vehicles through a construction zone using hand signals and a stop/slow paddle. In Ontario, flagger directions are legally equivalent to traffic signals. Failing to obey a flagger is a Highway Traffic Act offence and carries the same penalty as running a red light.
Quick Facts
Type
Temporary Sign
Shape
Diamond
Colours
Orange background with black flagger symbol
In this guide
What does the Flagger Ahead Sign mean?
A flagger is an authorized person who controls the movement of vehicles through a construction zone using hand signals and a stop/slow paddle. In Ontario, flagger directions are legally equivalent to traffic signals. Failing to obey a flagger is a Highway Traffic Act offence and carries the same penalty as running a red light.
What to do when you see it
Reduce speed significantly when you see this sign. Watch for the flagger and their paddle. Stop when the flagger displays the stop side. Proceed only when the flagger displays the slow side and waves you through. Do not rush past the flagger or ignore their signals. Treat them as you would a traffic signal.
Where you'll see it in Ontario
Flagger ahead signs are placed in advance of construction zones where the road is reduced to alternating one-way traffic, where equipment crosses the road, or where workers are directly adjacent to vehicle lanes.
G1 test relevance
The authority of flaggers is tested in the G1 exam under traffic control devices. Candidates must know that a flagger has the same legal authority as a traffic signal and that disobeying a flagger is an offence.
Common mistakes drivers make
Treating flagger instructions as suggestions and proceeding before being waved through is a dangerous and illegal mistake. Another error is following the vehicle ahead through the zone without checking whether the flagger has signalled your vehicle specifically.
Related Signs
Construction Zone Sign
The construction zone sign marks an area where road construction or maintenance work is underway. Reduced speed limits apply, fines are doubled for all offences, and drivers must obey all temporary traffic controls.
Learn moreRoad Work Ahead Sign
The road work ahead sign is an orange diamond sign that gives advance warning of a construction zone ahead. It signals drivers to slow down and prepare for changing road conditions, lane closures, or worker presence.
Learn moreLane Closed Sign
The lane closed sign warns that one or more lanes ahead are closed due to construction or maintenance work. Drivers must merge into the open lane before the closure begins.
Learn moreConstruction Speed Limit Sign
The construction speed limit sign is an orange sign showing a reduced speed limit that applies within a construction zone. Fines for exceeding this limit are doubled when workers are present.
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