Yesterday was a windy day. Karachi is a non-scenic city with a dense cloud of billboards all around, each pointing in a different direction held high by trunks of various thicknesses and strengths. A particular road where the traffic is pretty rough is blessed with more than its fair share of billboards. One of these was huge with a picture of a lady lying on a matress.
Obviously larger the area of a board, the more impact the wind would have on it, and since there is no way the air can go AROUND the board, it tries to go through. So the board flew straight on the road as would be expected, crumpling two cars and a motorcycle. God knows what happened to the rest of the traffic as cars screeched to a halt banging into each other like bumper cars.
Uncountable casualties by a small oversight. The road was a wreck and remained closed for hours until the authorities returned with a crane and cleaned the area up.
I would advise that if a few small holes were drilled at strategic locations in the billboard the wind may pass easily through and such accidents would not occur. On high wind days it would probably only rip the board appart (so the holes must be reinforced) but probably wont be fatal.
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