Teacher Defeats Traffic Ticket With The Power Of Math - The Consumerist

"I said, ‘If it's really short, then you got short-changed and you got a ticket illegally,'" said [Mike] Mogil.
The speed limit on Collier Boulevard, where she was cited, is 45 mph. According to county guidelines, the yellow light should be 4.5 seconds.

Mogil said he tested it 15 times with an average of only 3.8 seconds.