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Oregon Department of Transportation <br />Transportation Development Branch <br />Transportation Planning Analysis Unit <br />Preliminary Traffic Signal Warrant Analysis <br />Major Street: Coburg Road <br />Minor Street: 4th Avenue <br />Project: EWEB Master Plan TIA <br />City/County: Eugene, OR <br />Year: 2011 <br />Alternative: Existing Conditions <br />Preliminary Signal Warrant Volumes <br />Number of <br />Approach lanes <br />ADT on major street <br />approaching from <br />both directions <br />ADT on minor street, highest <br />approaching <br />volume <br />Major <br />Street <br />Minor <br />Street <br />Percent of standard warrants <br />100 1 70 <br />Percent of standard warrants <br />1 100 70 <br />Case A: Minimum Vehicular Traffic <br />1 <br />1 <br />8850 <br />6200 <br />2650 <br />1850 <br />2 or more <br />1 <br />10600 <br />7400 <br />2650 <br />1850 <br />2 or more <br />2 or more <br />10600 <br />7400 <br />3550 <br />2500 <br />1 <br />2 or more <br />8850 <br />6200 <br />3550 <br />2500 <br />Case B: <br />Interruption of Continuous Traffic <br />1 <br />1 <br />13300 <br />9300 <br />1350 <br />950 <br />2 or more <br />1 <br />15900 <br />11100 <br />1350 <br />950 <br />2 or more <br />2 or more <br />15900 <br />11100 <br />1750 <br />1250 <br />1 <br />2 or more <br />13300 <br />9300 <br />1750 <br />1250 <br />X <br />100 percent of standard warrants <br />70 percent of standard warrants <br />Preliminary Signal Warrant Calculation <br />Street <br />Number of <br />Lanes <br />Warrant <br />Volumes <br />Approach <br />Volumes <br />Warrant Met <br />Case <br />A <br />Major <br />2 <br />10600 <br />2733333 <br />`T <br />i <br />Minor <br />1 <br />2650 <br />151778 <br />Case <br />B <br />Major <br />2 <br />15900 <br />2733333 <br />�T <br />I <br />Minor <br />1 <br />1350 <br />151778 <br />Analyst and Date: <br />Reviewer and Date: <br />I Meeting preliminary signal warrants does not guarantee that a signal will be installed. When preliminary <br />signal warrants are met, project analysts need to coordinate with Region Traffic to initiate the traffic signal <br />engineering investigation as outlined in the Traffic Manual. Before a signal can be installed, the engineering <br />investigation must be conducted or reviewed by the Region Traffic Manager who will forward signal <br />recommendations to headquarters. Traffic signal warrants must be met and the State Traffic Engineer's <br />approval obtained before a traffic signal can be installed on a state highway. <br />2 Used due to 85th percentile speed in excess of 40 mph or isolated community with population of less than <br />10,000. <br />Analysis Procedures Manual <br />February 2009 <br />