This is a great example of creativity in data. Cisco has a billboard in San Francisco near to the airport, where the message changes depending on the speed of the car approaching.
The faster the car, the fewer the words, as the driver will have less time to read the message.
There are 4 speed ranges, but I'm sure this could be done with much more granularity
Not rocket science, clearly, but very clever.
See more at AdAge here
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