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Road flares should not be placed closely to a?

  1. Water source

  2. Gasoline leak

  3. Dead end

  4. Bridge

The correct answer is: Gasoline leak

Gasoline leaks can be extremely dangerous and flammable. Therefore, placing road flares closely to a gasoline leak increases the risk for fire or explosion. While water sources may be affected by the use of road flares, they do not pose the same level of immediate danger as gasoline leaks. Dead ends and bridges do not necessarily pose a danger when it comes to placing road flares.