Must have in all cars. These are safer and much better than triangular reflective hazard signs. These flares have magnets and can be easily attached to cars and unlike trialgular signs they will remain in the same spot and won't be blown away with high winds.
I will be getting another set for my loved ones.
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https://www.amazon.com/Flashing-Strobe-Emergency-Magnetic-Roadside/dp/B078YC99K7