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dgf. <br />Average Delay <br />Average delay for a pedestrian who is unable to cross immediately upon reaching the intersection <br />Uncontrolled Pedestrian Crossing Leve ef Service <br />Evaluation Worksheet <br />Average delay assumes that no motor vehicles yield and the pedestrian is forced to wait for an adequate gap. <br />• <br />d e— —( vtcx vt,G — <br />— v <br />crossing 1 <br />Step 4: Calculate <br />v = d <br />to Wait for <br />Adequate Gap (e.g., any pedestrian experiencing nonzero delay.) <br />where: dee = average gap delay for pedestrians who incur <br />nonzero delay <br />d = average pedestrian gap delay (s) <br />= probability of a delayed crossing <br />cros ' g 2 <br />where: de = average pedestrian gap delay (s) <br />tce = group critical headway (s) <br />vehicular flow rate across crossing (veh/s) <br />Step 5: Estirnate <br />Delay Reduction <br />due to Yielding <br />Vehicles <br />1. One -Lane Cross <br />crossing 2 <br />ds <br />Pd d Pd = dgd <br />When a pedestrian arrives at a crossing and finds an inadequate gap, that pedestrian is delayed until one of two <br />situations occurs: (a) a gap greater than the critical headway is available, or (b) motor vehicles yield and allow the <br />pedestrian to cross. While motorists are legally required to stop for crossing pedestrians in MN at all intersections <br />and at all marked crossings, motorist yield rates actually vary Considerably. <br />Some crossing treatments and yield rates based on research are provided on the next page. <br />Average pedestrian delay <br />dp = <br />h(i — 0.5) POD (Pd — <br />cros <br />f yielding is <br />zero, then skip <br />step 5) <br />Step 6: Calcul <br />Average <br />Pedestrian Delay <br />& Determine <br />LOS <br />Dov&oped by Bo <br />ing 1 <br />n = <br />d <br />g <br />P(Y) = PdMy(1— my)i-1 <br />Two -Lane Crossing <br />POD = <br />. Three -Lane Crossing <br />P <br />)=© <br />14. Four -Lane Crossing <br />crossing 2 <br />d, =1 <br />Mv = motorist yield <br />M Y) (42 MY2)1 <br />P <br />where: dp = average pedestrian delay (s) <br />= crossing event (i=1 to 72) <br />dgci h. = average headway for each through lane = <br />art) = probability that motorists yield to <br />pedestrian on crossing event i <br />n z nt(decjih), average number of crossing <br />events before an adequate gap is available, >0 <br />j= crossing event (j=0 to 2-1) <br />13(75),-, probability that motorists yield to <br />pedestrian on crossing event j <br />rate (decimal) Mg =[ <br />-Pb3My3 + 3 Pb2 — PaMy2 + 3 P1,(1 Pb)2 My <br />Pd <br />P = [Pa — P(Yi)lx [ <br />OS Control Delay (sec/ped) <br />A 0-5 <br />B 5-10 <br />C 10-20 <br />D 20-30 <br />E 30-45 <br />F >45 <br />n & Men, Inc. for the LRRB. <br />1,444Pb30.—P0My3+ —POZMy2+4Pb(1—Pb3)My <br />Pa <br />Comments <br />Summary <br />Average <br />LOS <br />Usually no conflicting traffic <br />Occasionally some delay due to conflicting traffic <br />Delay noticeable to pedestrians, but not inconvienencing <br />Delay noticeable/irritating, increased chance of risk -taking <br />Delay approaches tolerance level, risk -taking likely <br />Delay exceeds tolerance level high chance of risk -taking <br />HCM Catculations Sheet 2 <br />Page 4 of - <br />HCM Evaluation Worksheet <br />