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10000 VEHICLE TRIPS/HOUR <br /> DURHAM EXPRESSWAY, <br /> DURHAM TO RTP <br /> VOLUME-CAPACITY RELATIONSHIP <br /> 8000 <br /> 6000 <br /> WITH AN ADDITIONAL LANE <br /> 4000 -- EXISTING <br /> 2000 '-, <br /> AM PEAK HOUR, PEAK DIRECTION <br /> VOLUME <br /> 1-WAY LEVEL OF SERVICE D <br /> 1990 <br /> 1 I <br /> 1980 1966 2000 2010 <br /> YEAR <br />