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How a Diverging Diamond Interchange Works

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How a Diverging Diamond Interchange Works FILE NAME:c:\pwworking\gfpw01\jhamlet\d0530073\58299_I83-EXIT4_CO1_ROAD_PubMtg_DDI-Movements.dgn 5/16/2018 9:01:16 AM HOW ADIVERGINGDIAMONDWORKS direct leftturns,therearefewerconflictpointsthanastandarddiamondinterchangewhichreducesthecrashrateandseverity. versus 3phases.ThisallowstheDDItoprovidemoregreentimetrafficalleviatingcongestion.Additionally,becauseof The DDIconfigurationhasanoperationaladvantageoverthestandarddiamondinthatitonly2phasespersignalcycle side oftheroadatasignalbeyondbridge. off-ramps tomergeandallowsforadirectleftturnontheon-ramp.Thesideroad(PA851)trafficcrossesbackright crosses overtotheleftsideofroadatasignalizedintersectionpriorbridge.Thisallowsdirectturnsfrom A divergingdiamondinterchange(DDI)isuniquefromastandardinthatthesideroadtraffic(PA851), beyond thebridge. PA 851trafficcrossesovertotheleftsideofroadatasignalpriorbridge.Itbackright following thebridge(movements1&4). Traffic fromPA851canturnrightpriortothefirstsignalenteron-ramp(movements 2&3)orturnleftimmediately on toPA581(movements 1&4). Traffic fromtheoff-ramps canturnrightatasignaldirectlyontoPA 581(movements2and3)orturnleftata signal directly 2 2 4 4 3 3 1 1 SHREWSBURY SHREWSBURY SHREWSBURY SHREWSBURY I-83 NORTHTOPA851WEST I-83 SOUTHTOPA851WEST I-83 NORTHTOPA851EAST I-83 SOUTHTOPA851EAST PA 851WESTTOI-83SOUTH PA 851WESTTOI-83NORTH PA 851EASTTOI-83SOUTH PA 851EASTTOI-83NORTH 851 851 851 851 WESTBOUND PA851 EASTBOUND PA851 TO TO TO TO PA 851TOI-83MOVEMENTS I-83 TOPA851MOVEMENTS PA 851CROSSTRAFFIC 3 RAM P FROM RAM P FROM RAM P FROM RAM P FROM I-83 SOUTH I-83 SOUTH I-83 SOUTH I-83 SOUTH 2 I I I I - - - - 8 8 8 8 3 3 3 3 S S S S R R R R O O O O A A A A U U U U M M M M T T T T P P P P H H H H T T T T O O O O OVERVIEW 1 4 B B B B A A A A L L L L T T T T I I I I M M M M O O O O R R R R E E E E T T T T O O O O INTERSTATE INTERSTATE INTERSTATE INTERSTATE 83 83 83 83 T T T T O O O O Y Y Y Y INTERSTATE INTERSTATE INTERSTATE INTERSTATE O O O O 83 83 83 83 R R R R K K K K 1 I I I I - - - - 8 8 8 8 3 3 3 3 N N N N R R R 4 R O O O O A A A A R R R R M M M M T T T T P P P P H H H H T T T T O O O O 3 RAM P FROM 2 RAM P FROM RAM P FROM RAM P FROM I-83 NORTH I-83 NORTH I-83 NORTH I-83 NORTH S S S S T T T T E E E E W W W W A A A A R R R R TO TO TO TO T T T T S S S S T T T T O O O O 851 851 851 851 W W W W N N N N 5-16-2018.
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