Depends where they put it, but some spots don't stay empty for more than a mere 20 seconds. Often people are even waiting for the spot when they see someone getting in their car. So the best would to alert people after 80 seconds of vacancy.
“An engineer explained to us that hundreds of ear impressions were gathered in the name of research, and while each one obviously boasted its own unique shape and size, one single characteristic remained uniform across the board: the entrance into the ear canal is not a perfect circle, it's an oval.”
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Haha, I can imagine. Hopefully they will have the decency to alert one person once every 80 seconds until the spot if filled
Depends where they put it, but some spots don't stay empty for more than a mere 20 seconds. Often people are even waiting for the spot when they see someone getting in their car. So the best would to alert people after 80 seconds of vacancy.
This problem's already been solved in 802.11g (and numerous other comms standards): it's called collision avoidance.