SigSub Update
HCQS Mid-Year Meeting
August 3, 2013
Brooklyn, New York
Opportunity
TSS
PM’s
HCQS
PM’s
MAP 21 needs
ideas
What are our roles in operational PMs?
10 years ago we
would have
counted and
modeled
SWOT Analysis - SigSub
S
W
O
T
Strengths
• Method is used as a standard -12
• Open and fully document process -5
• Validated by peer reviewed research - 1
Weaknesses
• Somewhat complex ..Challenge of balancing
complexity and easy of explanation with fidelity
-11
• Lacks built in signal optimization -3
• Slow Adoption by public…many still using 2000 -3
• Difficult to compare across intersection plans
(RTOR, free rights)-2
• Difficult to analyze signals as a system - 1
• Lost essence of critical lane analysis, even
thought that is the core -2
Opportunities
• Simple Planning level procedure - 7
• Macro analysis positions technique well for reliability
analysis -3
• Training modules..perhaps leveraging technology -3
• Leveraging new data sources -2
• Readability and navigation of the document -2
• Standardizing the presentation of the output - 2
• Optimization -1
• Adaptive Control -1
• Integration between interrupted and un interrupted
facilities - 1
Threats
• Blackbox software with opaque
methodologies - Slick user interfaces - 11
• Maintaining relevance - 3
• Lag time from committee to software (new)
…Lag time for corrections to software - 1
• Funding for research - 1
• Simulation/Alternative tools -1
• Perceived complexity - 1
Users and Needs
• Who are our primary users?
• What are their needs?
• What applications are relevant most relevant
for HCM signalized intersection analysis?
Users
•
•
•
•
•
•
•
•
This was a surprise to
DB…believe it may be
inverted.. Perception vs.
reality…or terminology
Traffic Operations -15
Traffic Impact Analysis Engineers - 9
Educator and Students - 8
Software Developers - 7
Public Sector Decision Makers -5
Researchers -4
Signal Design Engineers - 1
Planners - 1
Shared Permitted Left Turn Issue
“The HCM 2010 and HCM
2000 procedures tend to
predict notably different
capacity and delay at
higher volumes for the onelane SPLT and the two-lane
SPLT.”
Bonneson, J. Working Paper 2: Supplement to Working Paper 1 on Shared Permitted
Left-Turn Lane Operation. November 19, 2012.
SPLT Task Group
•
•
•
•
•
•
Jim Bonneson
Bill Cisco
Christopher Kinzel
Daniel Morgan
Brandon Nevers
Scott Reinbacher
Test Configurations
Single Lane Configurations
Multi-Lane Configurations
Geometry A
Geometry D
Geometry B
Geometry E
Geometry C
Geometry F
Performance Measure = Subject Approach Control Delay
Test Software
• HCM 2000 – Treated as “Baseline”
• HCM 2010
–
–
–
–
Comp Engine 4.4 (w/o proposed fix)
Comp Engine Beta 6 (w/ proposed Mod to PRT)
Comp Engine Beta 7 (w/ Modification 1 and 2A)
Comp Engine Beta 8 (w/ Modification 1 and 2B)
• TransModeler
• Vissim
Recommended Modification (4.4 Beta 8)
Mod 1
Proposed
Original
Mod 2B
Duration of Perm Green Time in
Lane Vol Prediction Procedure
=
gu + gdiff x Plc
Phase Time = 50%
Phase Time = 60%
C = 120 Sec
C = 90 Sec
C = 60 Sec
Phase Time = 40%
V4.4 Beta 8
HCM 2000
Next Steps
• Confirm Reasonableness with City of
Milwaukee
• Present working paper to SigSub and Vote
• Present Motion to HCQS Committee to adopt
modifications in HCM