Word: batteryless
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Dates: during 1970-1979
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...electronic highway helpers vary in design, but most are batteryless, wireless contraptions about the size of a fuse box. They are usually mounted on sign posts at convenient intervals along the highway. To operate one, the distressed driver simply pulls down a lever-like cover, which winds up a small generator inside the device and exposes a panel with buttons labeled in both English and Spanish: SERVICE, POLICE, MEDICAL and CANCEL. When the motorist presses the appropriate button, the generator produces electricity. This energizes a solid-state FM radio transmitter, which sends a signal to a console at highway-patrol...
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