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U.S. Department of Transportation
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Case Study: London’s Low Emissions Zone
§How It Works
§Static road signs alert drivers when they are entering or leaving the low emissions zone.
§Closed circuit television (CCTV) cameras capture license plate numbers, and automatic license plate recognition (ALPR) technology uses optical character recognition software to identify vehicles by their license plates.
§System software compares them to a database of vehicles that meet the emissions standards to analyze whether payment is required.
§The system informs officials if a vehicle meets the emissions standards, is exempt, is registered for a discount or if the owner has already paid the daily charge.
§Benefits
§According to a 2006 study, concentrations of small particles from traffic sources were expected to decrease across London by 4.3 percent in 2008 and 8.0 percent in 2010 due to the Low Emissions Zone, and NOx was expected to decrease by 3.2 percent in 2008 and 4.1 percent in 2010.
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