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illin/DOT Traffic Signal Timing and Coordination Manual <br />Varying Betwee <br />n protected,Protected/Permissive, and Permissive Operation <br />As discussed above, the FYA can be considered a variable operation signal indication. Consider the <br />following items: <br />protected, protected/permissive, and permissive <br />operation between pro <br />1 All FYA signals may vary p <br />operation at various times of the day and night. <br />• will need to be analyzed individually to determine the time -of -day FYA <br />1 Each signal approach 1 <br />operation by considering the following criteria: <br />a) Cross -product oduct volumes of left turns and opposing throughs at various times of day <br />b) Speed limit <br />c) Sight distance limitations <br />d) Number of opposing through lanes <br />e) Double left turn lanes or single left turn lanes <br />f) Opposing left turn lane offset <br />g) Cross street or mainline approach <br />h) Comprehensive left turn crash analysis of approaches with similar characteristics <br />Test for Protected Only Operation 24 Hours per Day <br />In some cases, the left turn <br />indication should run in the most restrictive Protected -Only mode 24 hours per <br />day. Refer to Exhibit 3-13 for the Protected Only Left Turn Operation Guidelines. If the answer to question <br />1 <br />or2 is "yes", then protected operation should be used throughout the day. <br />Exhibit 343 Part 1: Protected -Only Left Turn Operation 24 Hours per Day <br />Part 1: Protected Only Operation - 24 hrs/day Guidelines <br />Question 1: Conflicting Left Turns <br />• llo the 9 posing left turn.paths conflict? . • <br />eci <br />• <br />Question 2: Limited S•ight Distance • - . <br />'have verylimited sight distahce as <br />•,/�{ . UQ�S the left turner .. . . , <br />�.! • • r • • • • • ' <br />r <br />d ' fh current AA5HTO "A Policy on Gearnetric <br />Designs of Highways and sweets"?. <br />>..if•fhe'.ansv er 4s ;Yes; the i use• •: - . <br />operation.2�4 hou�rsjday <br />I the ar saver` is o,• proceed, to.th'e <br />r - <br />• • next quesfion. - . ' <br />>•ifthe'ansyler isYes1-then use <br />ted DPgration.24 hours/day. <br />Prpte.� . <br />• define �n e _ . 06, > if he afisvyter is jroceed to part 2 <br />0 No to cheek :for FM ?YT?P:..--.. t <br />••n •�••• r se Pr�tec�ed.��,era�la�i'24 hours/day � : r . ..•y.. � ::- ':-• .;t <br />1fthe'13►n* et`-Is'Ye 0,Questiot�:°qr 2,•u ...; .er - _ ' •; :.'�' ��' . ' _ • ` • . • _• <br />- <br />.. � '.- 'i . y i'• ' • <br />" <br />•• '. S:_ 1 his•• <br />?•I'r• <br />; roGee . .. - ` ''• . • •...r . .. • .. _ .- <br />If the answer is "yes to any of questions uestions in Part 1, then Protected -Only operation is suggested <br />�E ,r 3-14)to <br />answer to all of the questions is "no", then proceed to Part 2 (Exhibit <br />throughout the day. If the <br />check for permissive FYA operation by time of day. <br />} <br />Page I 3-28 <br />Local Intersection Concepts May 201 <br />