Then through the use of GPS-based reference clocks at each tower (for both time and frequency), the signals are synced so each can emit a perfect copy of both signal and symbol data.

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The bill would require sites to offer easier methods of letting users prevent their behavior from being tracked online, warn users about data collection with a symbol on Web pages and require sites to render anonymous any data they collect after 18 months.

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In Navevo's case the data will be used to flash a warning symbol on its sat-nav maps when a driver approaches a "warning zone" with a 50m (164ft) radius circle drawn around the area.

BBC: Navevo sat-nav offers cyclist alerts to lorry drivers

The great symbol of American mobility is morphing into a network device, a data-generating green machine plugged into a matrix of power grids, cloud computers and social media.

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