re: Why do people use their emergency flashers when it’s raining?

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It isn't illegal and that is one of the reasons we have them. It allows you to see cars when vision is limited like in thunderstorms or blizzards.

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Those who use flashers during bad weather say it’s about increasing visibility. However, the Johns Creek Police Department — located outside Atlanta — says using the lights can make other drivers think you’re stopped or stalled.

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Alabama: The use of hazard lights is permitted while driving unless otherwise posted.
Alaska: The use of hazard lights is not permitted while driving.
Arizona: Hazard light use is not permitted while driving except in an emergency situation.
Arkansas: Hazard light usage is not permitted while driving except to indicate a traffic hazard.
California: Hazard light use is not permitted while driving except to indicate a traffic hazard.
Colorado: Hazard light use is not permitted while driving except if the vehicle speed is 25 mph or less.
Connecticut: Hazard light use is permitted while driving unless otherwise posted.
Delaware: Hazard light use is not permitted while driving except to indicate a traffic hazard.
District of Columbia: Hazard light use is permitted while driving.
Florida: The use of hazard lights is not permitted while driving.
Georgia: The use of hazard lights is permitted while driving.
Hawaii: Hazard light use is not permitted while driving.
Idaho: Hazard light use is not permitted while driving except to indicate the presence of a vehicular traffic hazard requiring unusual care in approaching, overtaking or passing.
Illinois: The use of hazard lights is not permitted while driving.
Indiana: Hazard light use is not permitted while driving except in emergency situations.
Iowa: The use of hazard lights are not permitted while driving except to indicate a traffic hazard.
Kansas: Hazard light use is not permitted while driving.
Kentucky: Hazard light use is permitted while driving.
Louisiana: Hazard light use is not permitted while driving.
Maine: Hazard light use is not permitted while driving unless to indicate a traffic hazard.
Maryland: Hazard light use is not permitted while driving except in emergency situations.
Massachusetts: Hazard light use is not permitted while driving.
Michigan: Hazard light use is permitted while driving.
Minnesota: Hazard lights are not permitted while driving except to indicate a traffic hazard.
Mississippi: Hazard light usage is permitted while driving.
Missouri: Hazard light usage is permitted while driving.
Montana: Hazard lights are not permitted while driving except to indicate a traffic hazard.
Nebraska: Hazard light use is permitted while driving.
Nevada: Hazard light usage is not permitted while driving.
New Hampshire: Hazard light use is permitted while driving.
New Jersey: The use of hazard lights is permitted while driving.
New Mexico: Hazard light use is not permitted while driving.
New York: Hazard light use is permitted while driving unless otherwise posted.
North Carolina: Hazard light use is permitted while driving unless otherwise posted.
North Dakota: Hazard light use is permitted while driving unless otherwise posted.
Ohio: Hazard light use is not permitted while driving except when a hazardous condition is present.
Oklahoma: Hazard light use is not permitted while driving except in emergency situations and to indicate a traffic hazard.
Oregon: Hazard light use is permitted while driving unless otherwise posted.
Pennsylvania: Hazard light use is permitted while driving.
Rhode Island: Hazard light use is not permitted while driving.
South Carolina: Hazard lights may be used while driving for the purpose of warning the operators of other vehicles of the presence of a vehicular traffic hazard requiring the exercise of unusual care in approaching, overtaking or passing.
South Dakota: Hazard light use is permitted while driving.
Tennessee: Hazard light use is not permitted while driving except in emergency situations.
Texas: Hazard light use is permitted while driving.
Utah: Hazard light use is permitted while driving.
Vermont: Hazard light use is permitted while driving.
Virginia: Hazard light use is not permitted while driving except for emergency vehicles, stopped or slowed vehicles to indicate a traffic hazard, when traveling as part of a funeral procession, or traveling slower than 30 mph.
Washington: Hazard light use is not permitted while driving except to indicate a traffic hazard.
West Virginia: Hazard lights are not permitted while driving except in emergency situations.
Wisconsin: Hazard lights are not permitted while driving except to indicate a traffic hazard or when a hazardous condition is present.
Wyoming: Hazard light use is permitted while driving.

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