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1 <br />1 % <br />1 <br />Left Turn Signals - ODOT Warrants for Phasing <br />Intersection <br />Left Turn Study Date <br />LT Phase Warranted? YES NO Type of Phasing <br />A left turn signal should be provided when any one of the following warrants are met. Opposing left <br />turn approaches should have the same type of phasing. <br />1) A minimum of 60 left turns per hour in the peak <br />hour, with the product of opposing and left turn <br />peak hour volumes exceeding the appropriate <br />value in the table to the right. <br />Random Arrival: no signal within 1,500' <br />Platoon arrival: signal within 1,500' <br />LT x OgpoSi .Traffitc -Valti s, " <br />$Y' <br />85th Percentile or Posted Speed <br /># of Opposing Lanes <br />Arrival Type <br />1 <br />2 <br />Random <br />45,000 <br />90,000 <br />Platoon <br />50,000 <br />100,000 <br />Warrant 1 Met? <br />2) The left turning movement crosses three or more lanes of opposing through traffic. <br />Warrant 2 Met? <br />3) The 85th percentile or posted speed of opposing traffic exceeds 45 mph. <br />85th percentile speed Posted speed <br />Speed study date Warrant 3 Met? <br />4) Five or more left turn accidents within a twelve month period, correctable by a left turn signal. <br />Number of Accidents 12 month period <br />Warrant 4 Met? <br />5) Sight distance to oncoming_ traffic less than that shown in following table. <br />Warrant 5 Met? <br />6a) Intersection with unusual geometric configuration Warrant 6a Met? <br />6b) Engineering study indicates need for left turn phasing. Warrant 6b Met? <br />85th Percentile or Posted Speed <br />Minimum Sight Distance <br />35 mph or less <br />250 feet <br />Over 35 mph <br />400 feet <br />Warrant 5 Met? <br />6a) Intersection with unusual geometric configuration Warrant 6a Met? <br />6b) Engineering study indicates need for left turn phasing. Warrant 6b Met? <br />