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U.S. Department of Transportation
Research and Innovative Technology Administration
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Communications System for Security
§For an “All DSRC” scenario, the number of RSEs nationwide depends on risk tolerance and coverage requirements:
□Estimates vary from 1300 RSEs to150,000 RSEs
□Unanswered Questions: 
▪What level of coverage is acceptable?
▪How frequently must a vehicle interact with the system?
§Lowest cost scenario hinges on number of RSEs required
□Cellular scenarios are lowest cost if “All DSRC” requires many RSE
□OBE costs become most important if “All DSRC” requires fewer RSE
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