A public service advertisement in Turkey, which is actually a cut out cop car parked along side the highway behind a billboard became an effective road safety precaution for drivers who see it. From a far, it seems a real cop car making someone slow down which enables them to read the billboard.
Implications - Any innovation that helps save lives without being intrusive or requiring a huge amount of resources to implement is going to be widely accepted by society, and it's always inspiring to see a simple concept being put to good use. Initiatives like this are a great example of how ingenuity can lead to ideas that pay dividends well beyond their cost.
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