Transcript 2010 SCOD AFB10 Research-Ray

Geometric Design
Strategic Research Program
Transportation Research Board
AFB10 Geometric Design Committee
Brian L. Ray, PE Committee Chair
July 27, 2010
What have we heard so far?
 Freight
design criteria
 Complete Streets
 2015 Green Book Topics
 Highway Safety Manual
 Flexibility in preliminary Engineering
 Right sized projects
 Urban street design standards
 Practical Design
 Others?
What will be the basis of our design
decisions?
RESEARCH!
Presentation Outline
 Overview
of the TRB Geometric Design
Committee
 Geometric
Design Strategic Research
 Opportunities
for Collaboration
Committee Scope
Expanding the body of knowledge regarding highway and
street geometric design elements that affect safe and efficient
operations for all users.
Developing research needs statements and communicating
findings that advance geometric design criteria, guidance,
methods, and performance-based design objectives.
Facilitating domestic and international dialogues and idea
exchanges while supporting emerging and developing
professionals
Committee Structure
 Research
Subcommittee purpose
– Coordinate and manage the strategic
research program
– Produce the research needs statements using
the input from others
Committee Structure
 Technical
Subcommittee purpose
– Conduct activities that lead our exploration of
technical issues and priorities.
– Subgroups:
•
•
•
•
Streets and Intersections;
Highways;
Freeways and Interchanges; and
Methodology
Committee Structure
Business Subcommittee purpose
– Execute reoccurring and ad-hoc committee
business
– Conduct outreach to external sources in
support of committee business,
– Coordinate special assignments and forums
as they arise
AASHTO Members
Jim
Bart
Brewer/Kansas
Thrasher/Virginia
Presentation Outline
 Overview
of the TRB Geometric Design
Committee
 Geometric
Design Strategic Research
 Opportunities
for Collaboration
Current Research Needs
Documentation
 Transportation
E-Circular
(E-C110)
 22
research
needs statements
http://onlinepubs.trb.org/onlinepubs/circulars/ec110.pdf
Research Needs Development Process
Brainstorm Research Needs
Santa Fe, NM
2002

Form Steering Committee
Plan Geometric Design
Research Needs Workshop
2002 - 2004
Prepare 7 White Papers
2003 - 2004
“Re-thinking” Design Process
Design Controls/Criteria
User/Vehicle Controls
Rural Highways
Freeways/Interchanges
Urban Streets
Intersections
Form Methodology, Highways,
Freeway/Interchanges, &
Streets/Intersections Technical
Groups to update plan
January 2009
Prepare 22 Research Needs
Statements
TRB E-circular E-110
January 2007
Strategic Research Needs
Workshop
Williamsburg, VA
2004
TRB Committees on
Geometric Design (AFB10)
& Operational Effects of
Geometrics (AHB65) &
AASHTO Technical
Committee on Geometric
Design
TRB Mid-year Meeting
Update Research Plan
Woods Hole, MA
July 2009
Prepare Updated Research
Needs Document
18 topics + syntheses
2010-2011
“Original” Research Needs
No.
1
2
3
4
5
6
7
Problem Statement Title
Median Design and Barrier Issues in Urban and Rural
Environments
Performance-based Geometric Design Analysis
Multimodal Highway Design for “Complete Streets”
Investigation of Alternative Geometric Highway Design Processes
Horizontal Curve Design Philosophy
Right-turn Interactions and Channelized Right-turns
Ramp and Interchange Spacing
Transition Zone Design
Ramp Design as a System
Safety and Operational Tradeoffs of and Shoulder Widths
Safety, Operations, and Usability Tradeoffs of Road User Groups
Safety and Operational Impacts of Four-and Six- Lane Cross12
sections with Raised versus Two-way Left-turn Lanes
Superelevation Criteria for Steep Grades on Horizontal Curves
13
Geometric Design Guidelines for Major Intersection Alternatives
14
to Accommodate Multimodal Users
Design, Safety, and Operational Considerations of Pedestrian
15
Treatments at Intersections
One- and Two-lane Loop Ramp Design
16
Effectiveness of Mid-block Crossing Treatments
17
Intersection Design to Accommodate Pedestrian Crosswalk Cross
18
Slopes
Guidelines for Provision of Sidewalks
19
Safety Effects of Intersection Skew Angle
20
Accommodating Bicyclists on Rural Highways
21
Safety and Operational Effects of Angle versus Parallel Parking
22
Other Funded Projects
Placement of Traffic Barriers on Roadside and Median Slopes
8
9
10
11
Funded
(Y/N)
Project No.
Considered for
Begin Date
Funding (Y/N)
Y
NCHRP 22-21
Y
Y
NCHRP 15-34
Y
End Date
Amount
Jan. 2006
Jan. 2009
$800,000
Y
July 2006
Dec. 2009
$600,000
NCHRP 3-89
Y
April 2008
October 2009
$500,000
Y
NCHRP 3-88
Y
June 2008
December 2010
$500,000
Y
NCHRP 15-40
Y
FY 2010
TBD
$300,000
Y
NCHRP 15-39
Y
FY 2010
TBD
$500,000
FY 2010
TBD
$300,000
N
Y (FY 2010)
Y
NCHRP 15-42
Y
Y
NCHRP 22-22
Y
Pending
$500,000
Funded Synthesis Statements
 Topic
40-07: Trade-off Considerations in
Highway Geometric Design
 Topic
40-08: Effective Speed Reduction
Techniques for Rural High to Low Speed
Transitions
 Topic
41-01: Geometric Design Practices for
Resurfacing, Restoration, and Rehabilitation
UPDATING STRATEGIC
RESEARCH NEEDS
July 2009 Mid-year meeting
Process
 Form
–
–
–
–
four technical subgroups:
Methodology
Highways
Freeways and Interchanges
Streets and Intersections
 Review
and update existing white papers
 Review and update unfunded research needs
statements
 Identify emerging topics
PRIORITIZED RESEARCH NEEDS
AFB10/AHB65
Methodology/Design Controls
 Critical
assessment of geometric design policies
and practices
 Safety effects of intersection sight distance
 Updating decision sight distance criteria
 Applying geometric design criteria in
intermediate speed range
 Forgiving roadside design (coordinate with
AFB20)
 Bicycle safety prediction methodology
Highways
 Safety
evaluation of 13 controlling criteria*
 Study of vehicle paths on horizontal curve
transitions*
 Speed prediction models for multilane
rural/suburban highways
 Speed prediction models for trucks
 Relationship between safety, roadway lighting,
and geometric design features
*Developed and considered by AASHTO
AFB10/AHB65
Freeways and Interchanges
 Integrated
Ramp and Ramp Terminal
Design*
 Multilane Loop Ramp Design*
 Allocation of Freeway Lane and Shoulder
Widths
*Developed and considered by AASHTO
AFB10/AHB65
Streets and Intersections
 Auxiliary
Turn Lane Design Guidance and
Policy Upgrades*
 Safety effects and implementation of
intersection skew angles
 Intersection design and evaluation
guidebook
 Comprehensive roadway design for
complete streets
*Developed and considered by AASHTO
AFB10/AHB65
Synthesis Topics
Design and maintenance of traffic during construction
 Curve and cross-section design on temporary facilities
 Truck facility design (marshaling yards, truck-only ramps)
 Highway design to support traffic enforcement
 Barrier toll plaza vs. open-road tolling design
 Current practices for provision of sidewalks
 Vertical pavement profiles at intersections
 Crosswalk cross-slope design practices

AFB10/AHB65
“Updated” Research Program
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Problem Statement Title
Developing Design Criteria for Cost-effective Multi-lane Loop
Ramp Design
Safety Evaluation of 13 Controlling Criteria for Design
Auxiliary Turn Lane Design Guidance and Policy Upgrades
Integrated Ramp and Ramp Terminal Design
Study of Vehicle Paths on Horizontal Transition Curves
An Assessment of Geometric Design Policies and Processes
Intersection Sight Distance and Safety
Decision Sight Distance
Applying Geometric Design Criteria within The Intermediate
Speed Range
Forgiving Roadway Design
Development of a Bicycle Safety Prediction Methodology
Effective Allocation of Available Freeway Travel Lane and
Shoulder Widths
Impacts and Implementation of Skew Angles
Intersection Design and Evaluation Resource
Comprehensive roadway design (complete streets)
Speed Prediction Models for Multilane Rural/Suburban Highways
Speed Prediction Models for Trucks
Lighting-Safety-Geometric Design Feature
Funded
(Y/N)
Project No.
N
Y
Y
N
Considered for
Funding (Y/N)
Begin Date
End Date
Amount
Sp 2011
Sp 2011
TBD
TBD
$600,000
$400,000
N (FY 2011)
NCHRP 17-53
NCHRP 3-102
Y
Y
N (FY 2011)
Presentation Outline
 Overview
of the TRB Geometric Design
Committee
 Geometric
Design Strategic Research
 Opportunities
for Collaboration
In general…
 Support
the effort to update Transportation
Research E-circular
 Provide
input and support on existing and
new research needs statements and
synthesis topics
 Share
ideas on Green Book revision and
other research needs
2010 and 2011…
 Share
results of Green Book needs discussion
from this SCOD meeting
 Obtain
input from 2010 Green Book update
effort
 Identify
 Plan
other emerging needs
for the joint Mid-year 2011 meeting with
TRB and AASHTO Technical Committee on
Geometric Design
Questions?
Interested?
Contact:
Brian Ray
Kittelson & Associates, Inc.
[email protected]