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PennDOT’s Roundabout Program July 7, 2010 Colleen Brown, Fran Hanney, PennDOT Ed Myers, P.E. Kittelson & Associates, Inc. (410) 347-9610.

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Presentation on theme: "PennDOT’s Roundabout Program July 7, 2010 Colleen Brown, Fran Hanney, PennDOT Ed Myers, P.E. Kittelson & Associates, Inc. (410) 347-9610."— Presentation transcript:

1 PennDOT’s Roundabout Program July 7, 2010 Colleen Brown, Fran Hanney, PennDOT Ed Myers, P.E. Kittelson & Associates, Inc. (410) Peach Bottom (York Co.), PA

2 Presentation Overview Statewide Roundabout Inventory PennDOT’s Roundabout Guide Case Study: Marshalls Creek Williamsport, PA

3 Pennsylvania Roundabout Inventory Sources of Information –June 2008 Michael Baker Jr. Inc. report -Determined if circular intersections were modern roundabouts or not -Identified roundabouts in state at that time (all single-lane) –9 existing roundabouts –8 planned roundabouts –Contacted PennDOT District Roundabout Coordinators in Fall 2009 to update this inventory Results –10 existing single-lane roundabouts –1 existing double-lane roundabout –2 roundabouts under construction –10 roundabouts planned –5 roundabouts in alternatives analysis Quakertown, PA Photo: Michael Baker Jr., Inc.

4 Pennsylvania’s Roundabouts

5 PennDOT Roundabout Guide PennDOT Guide to Roundabouts (Publication No. 414) published June Based upon Kansas Roundabout Guide (2003) Like KDOT Guide, PennDOT Pub. 414 is intended to supplement FHWA’s Roundabouts: An Informational Guide (2000) Roundabout experience gained in US this decade has been incorporated into state roundabout guides

6 PennDOT Roundabout Guide Chapters 1 – Introduction 2 – Public Involvement Considerations 3 – Planning 4 – Operation 5 – Roundabout Safety 6 – Geometric Design 7 – Traffic Design 8 – System Considerations Will update when new FHWA Guide is published. Ch. 6 – Geometric Design Ch. 7 – Traffic Design Ch. 4 – Operation

7 Case Study: Marshalls Creek Bypass Location –Village of Marshalls Creek in Poconos –4 miles north of I-80 and 6 miles east of Stroudsburg –In state’s fastest growing county (Monroe) Need for bypass –Two closely spaced signals at offset T intersections create congestion –Environmental and historic constrains prevent widening in village

8 Marshalls Creek Bypass: New Intersections Site of north intersection Site of south intersection Photos: Pete Jenior

9 Marshalls Creek Bypass – Intersection Options Northern Intersection Southern Intersection Old road into village Bypass US 209 Old road into village Bypass US 209

10 Marshalls Creek Bypass – Intersection Delay Roundabouts will create about 1/3 the delay that traffic signals would

11 Marshalls Creek Bypass V/C Ratio Roundabouts will have more available capacity to be used when traffic volumes exceed weekday p.m. levels (i.e. holidays)

12 Marshalls Creek Bypass – Intersection Cost

13 Marshalls Creek Bypass – Intersection Selection Southern Intersection – Roundabout –Less Delay versus signal –More available capacity for weekend/holiday traffic versus signal –Same cost as signal Northern Intersection – Traffic Signal –More delay versus roundabout –Less available capacity versus roundabout –Lower cost than roundabout –Smaller footprint and fewer impacts than roundabout Contract for entire bypass expected to be let in 2010

14 Questions? Spring Grove, PA


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