Given that it can be difficult to spot even three vehicles ahead of you on the highway, you can probably appreciate the consideration that went into the Air Warning's design. Thought up by Lim Dong Hyun and Kim Yoon Ho, this contraption would enlarge in the event of a car accident to notify motorists in advance about the conditions to come.
The triangular base of the hazard sign can be easily activated with a foot's push, causing the upper portion to inflate, rise up and double in height. What's displayed is a highly visible triangular prism in a bright red color and with the word "DANGER" printed across it. Floating up at several times above the roof of vehicles, the Air Warning can easily be seen with sufficient time to slow down.
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