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U.S. Department of Transportation
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Dynamic Speed Harmonization (SPD-HARM)
§Monitors traffic and weather data captured from multiple sources, and calculate a target speed for vehicles. 
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§Target speeds may be advisory or enforced, and may vary by location (e.g., distance upstream of a recurrent bottleneck), and by lane. 
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§Provision of target speeds can be initiated
□when detected congestion exceeds a
□pre-defined threshold or when congestion
□Is impending.
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§Applicable to freeways and arterials.
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Figure from Bob Sheehan’s ATDM presentation