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When should you use 4-way flashers while driving on the highway?
Four way flashers are meant to be used as a warning.
4.28 (7) Turn signals, or side-marker lamps used in conjunction with turn signals, may be used as warning lights by a slow moving vehicle as described in Division 7B or as warning lights whenever a vehicle is disabled on a highway.
The Ministry of Transportation also posts warning signs (not regulatory) on steep grades.
W-325 SLOW TRUCKS USE 4-WAY FLASHERS ON GRADE SIGN
The W-325 SLOW TRUCKS USE 4-WAY FLASHERS ON GRADE warning sign advises commercial vehicle operators and other large vehicles to use their 4-way flashers when traveling downhill to alert other motorists of the speed differential between their vehicle and the other vehicles.
This sign may be used on grades where the operating speed of large trucks is expected to drop 30 km/h or more below the posted speed limit.
It is restricted in use, and should be used on high speed, multi-lane highways or freeways only under the authorization of the Senior Traffic Engineer in consultation with Highway Safety Section. W-326
This sign should be installed at the start of and intermittently along steep and/or long grades.
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