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2017-05-10 CC Packet
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2017-05-10 CC Packet
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Mn/DOT Traffic Signal rming and Coordination Manual <br />Varying Between 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 />✓ <br />All FYA signals may vary operation between protected, protected/permissive, and permissive <br />operation at various times of the day and night. <br />✓ Each signal approach will need to be analyzed individually to determine the time -of -day FYA <br />operation by considering the following criteria: <br />a) Cross -product 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 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 or 2 Is "yes", then protected operation should be used throughout the day. <br />Exhibit 3-13 Part 1: Protected -Only Left Turn Operation 24 Hours per Day <br />Part 1: <br />- 24 hrs/dav Guidelines <br />Question 1: Conflicting Left Turns <br />t' Do tfie opQp;frig left turn:paths eon lct� <br />>;I 'tiidari$04 is )fe ; tlieiZ use <br />• TPS <br />'S«fa <br />PtStgc �l Op¢ at)oh.24 hour's/d0' <br />toY <br />> If the > jlsier �syo; p�o�eed, to the <br />`O <br />n"ei�t pUesflon. <br />Question 2: Limited sight Distance <br />Does the left t� mtr have very Ilmite'd sight dfstahce'as <br />Yes <br />> If th@'ails�ni�r Is Ye§,•then use <br />defirigd In'the current AASHTO "A Policy on Geometric <br />hrptiictdd Opgratlori•24 hours/day. <br />besigns of Highways and Streets"? <br />> if%e arisuv 'i• is liid, pr4ceed to part 2 <br />0 <br />to cheek fo j FYA Icy °rOb. <br />i.jt,l�Htive�' 1s1�~e§# ii(''. �oii �,'o` 2;11s f?ro1 radio 2q hbu�s�dt�... •, <br />�..•'''%',:: `' s �' ,. <br />'4 <br />I f t e, b'S �' j�fb eil <br />It svde'ir )JU�,. P.' <br />. J*'-*' • Y ,., 1 <br />, <br />> • • �• ' �• -'!t. w ..Y. .Ir i:n . ? 1•a•'1. a <br />•1 \v..i�.. y i vl tC t..s j0}'n �7 i'•f �-" �• <br />If the answer is "yes" to any of the questions in Part 1, then Protected -Only operation is suggested <br />throughout the day. If the answer to all of the questions Is "no", then proceed to Part 2 (Exhibit 3-14) to <br />check for permissive FYA operation by time of day. <br />Page 3-28 Local Intersection Concepts May 2011 <br />137 <br />
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