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

PennDOT’s Roundabout Program

July 7, 2010

Colleen Brown,Fran Hanney, PennDOT

Ed Myers, P.E.Kittelson & Associates, [email protected](410) 347-9610

Peach Bottom (York Co.), PA

Presentation OverviewPresentation Overview

Statewide Roundabout InventoryPennDOT’s Roundabout GuideCase Study: Marshalls Creek

Williamsport, PA

Pennsylvania Roundabout InventoryPennsylvania 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.

Pennsylvania’s RoundaboutsPennsylvania’s Roundabouts

PennDOT Roundabout GuidePennDOT Roundabout Guide

PennDOT Guide to Roundabouts (Publication No. 414) published June 2007.

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

PennDOT Roundabout Guide ChaptersPennDOT Roundabout Guide Chapters

1 – Introduction2 – Public Involvement Considerations3 – Planning4 – Operation5 – Roundabout Safety6 – Geometric Design7 – Traffic Design8 – System Considerations

Will update when new FHWA Guideis published.

Ch. 6 – Geometric Design

Ch. 7 – Traffic Design

Ch. 4 – Operation

Case Study: Marshalls Creek BypassCase 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

Marshalls Creek Bypass: New IntersectionsMarshalls Creek Bypass: New Intersections

Site of north intersection

Site of south intersection

Photos: Pete Jenior

Marshalls Creek Bypass – Intersection OptionsMarshalls Creek Bypass – Intersection Options

Northern Intersection

Southern Intersection

Old road into village

Bypass

US 209

Old road into village

Bypass

US 209

Marshalls Creek Bypass – Intersection DelayMarshalls Creek Bypass – Intersection Delay

0

5

10

15

20

25

30

35

40

South Intersection North Intersection

Seco

nds

of D

elay

per

Veh

icle

Signal

Roundabout

Roundabouts will create about 1/3 the delay that traffic signals would

Marshalls Creek Bypass V/C RatioMarshalls 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)

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

South Intersection North Intersection

Vol

ume-

to-C

apac

ity R

atio

Signal

Roundabout

Marshalls Creek Bypass – Intersection CostMarshalls Creek Bypass – Intersection Cost

$0

$1

$2

$3

$4

$5

$6

South Intersection North Intersection

Co

st in

Mill

ion

s o

f D

olla

rs

Signal

Roundabout

Marshalls Creek Bypass – Intersection SelectionMarshalls 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

Questions?Questions?

Spring Grove, PA