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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