Transcript PennDOT’s Roundabout Program

PennDOT’s Roundabout
Program
July 7, 2010
Colleen Brown,
Fran Hanney,
PennDOT
Ed Myers, P.E.
Kittelson & Associates, Inc.
[email protected]
(410) 347-9610
Peach Bottom (York Co.), PA
Presentation Overview
Statewide Roundabout Inventory
PennDOT’s Roundabout Guide
Case Study: Marshalls Creek
Williamsport, PA
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
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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 Roundabouts
PennDOT 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 Chapters
1
2
3
4
5
6
7
8
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Introduction
Public Involvement Considerations
Planning
Operation
Roundabout Safety
Geometric Design
Traffic Design
System Considerations
Ch. 7 – Traffic Design
Will update when new FHWA Guide
is published.
Ch. 6 – Geometric Design
Ch. 4 – Operation
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
Marshalls Creek Bypass: New Intersections
Site of north intersection
Site of south intersection
Photos: Pete Jenior
Marshalls Creek Bypass – Intersection Options
Northern Intersection
Old road into village
Bypass
Old road into village
Bypass
Southern Intersection
US 209
US 209
Marshalls Creek Bypass – Intersection Delay
Seconds of Delay per Vehicle
40
35
30
25
Signal
Roundabout
20
15
10
5
0
South Intersection
North Intersection
Roundabouts will create about 1/3 the delay that
traffic signals would
Marshalls Creek Bypass V/C Ratio
100%
Volume-to-Capacity Ratio
90%
80%
70%
60%
Signal
Roundabout
50%
40%
30%
20%
10%
0%
South Intersection
North Intersection
Roundabouts will have more available capacity
to be used when traffic volumes exceed
weekday p.m. levels (i.e. holidays)
Marshalls Creek Bypass – Intersection Cost
Cost in Millions of Dollars
$6
$5
$4
Signal
Roundabout
$3
$2
$1
$0
South Intersection
North Intersection
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
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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?
Spring Grove, PA