"Hey," I asked it, "You know those signs on 101 that say how long it takes to reach certain destinations at that instant? How do they work? Do they scan average speed along every step of the way? Do they photograph cars and then see how long until those same cars arrive at various checkstops? Do they have test cars that just track their speed? Those signs are incredibly handy, but I want to know how they work."
"Let me answer your question with a question," the parking meter said back, "How hard would it be to remake a car so it uses an Atari 2600 joystick instead of the existing controls?"
Stupid San Francisco Parking. Now I'm stumped on two questions!
Help me out?