LED Road Flares Emergency Lights - 3-Pack DOT Compliant Safety Disc Kit with Whistle & Batteries - Roadside Emergency Car Kit for Breakdowns, Accidents & Nighttime Visibility

I have not had the bad fortune to use these, but I used similar more bulky LED lights at a vehicle crash and it made a big difference. I did unbox and unwrap these to ready them for use. The carrying case is easy to use one-handed. I will test out the tool included at a later date. Each light worked well, the magnet did stick on the side of the vehicle (even on a dirt covered area) without any problems. The light is bright and very noticeable. I purchased the set of six, which allows one for the roof of the vehicle, and five to use as guides on the ground. You have to decide which sequence of flashes you feel are appropriate for your situation. Some may cause confusion if bunched too close, but I can see a use for each sequence. I did like the sequence which provides a simple flash sequence and a top light which would angle a bright white steady light to a working area, (example changing a tire, under the hood toward the battery or engine.). I am going to test them in a large parking lot on a foggy day to get an idea of the warning distance it provides to other drivers. I am unsure of its night time distance or daylight visibility. I was not sure of the whistle, but after expanding the use of this kit beyond a car this would be great for a boat that has lost power on the water, or provide one to each hiker in a party of six, just in case someone gets lost. I think this is a good buy, and will give these out as gifts in the future, just for some peace of mind.