Transcript TRB 87th Annual Meeting Google-Map-Based Online Platform for Arterial Traffic Information and Analysis Google-Map-Based Online Platform for Arterial Traffic Information and Analysis Yao-Jan Wu Dr.

TRB 87th Annual Meeting
Google-Map-Based Online Platform for Arterial Traffic Information and Analysis
Google-Map-Based Online
Platform for Arterial Traffic
Information and Analysis
Yao-Jan Wu
Dr. Yinhai Wang
Jan, 16, 2007
87th TRB Annual Meeting
1
TRB 87th Annual Meeting
Google-Map-Based Online Platform for Arterial Traffic Information and Analysis
Outline
•
•
•
•
•
Introduction
System Architecture
Implementation
Evaluation and Applications
Summary
2
TRB 87th Annual Meeting
Google-Map-Based Online Platform for Arterial Traffic Information and Analysis
Outline
•
•
•
•
•
Introduction
System Architecture
Implementation
Evaluation and Applications
Summary
3
TRB 87th Annual Meeting
Google-Map-Based Online Platform for Arterial Traffic Information and Analysis
Web Based Traffic Information
System
• An example
– Washington State Department of
Transportation
• Puget Sound Traffic Flow Map
4
TRB 87th Annual Meeting
Google-Map-Based Online Platform for Arterial Traffic Information and Analysis
Google-based Traffic
Information System
• Seymour, E.J. Miller, B.(2007). Google-Based
Mapping System for Traffic Management Center
Web Navigation, TRB
– http://daltrans.org/
5
TRB 87th Annual Meeting
Google-Map-Based Online Platform for Arterial Traffic Information and Analysis
Arterial Traffic Information System
• Bellevue Real-Time
Traffic Map
–
–
–
–
Not in right scale
Less interactive
Analysis?
Research?
Source: http://www.ci.bellevue.wa.us/
6
TRB 87th Annual Meeting
Google-Map-Based Online Platform for Arterial Traffic Information and Analysis
On-line Analytical Tools
• PORTAL: Portland Oregon
Regional
Transportation Archive Listing
– [Bertini et al.,2005]
• Freeway Performance
Measurement System (PeMS)
– [Kwon et al.,2006]
7
TRB 87th Annual Meeting
Google-Map-Based Online Platform for Arterial Traffic Information and Analysis
Outline
•
•
•
•
•
Introduction
System Architecture
Implementation
Evaluation and Applications
Summary
8
TRB 87th Annual Meeting
Google-Map-Based Online Platform for Arterial Traffic Information and Analysis
9
System Architecture
Clients
(Data users)
Traffic Engineers
STAR Lab
CSS
City of Bellevue
HTTP
XHTML
HTTP
Graphical
Library
Ajax
FTP
Researchers
HTTP
XML
Loop Controoler
PHP
Javascript
HTTP Web Server
Database Server
FTP Server
Data Server at the
Traffic Management Center
Loop Controoler
Google
Maps API
Travelers
Loop Controoler
TRB 87th Annual Meeting
Google-Map-Based Online Platform for Arterial Traffic Information and Analysis
Outline
• Introduction
• System Architecture
• Implementation
– Data Organization
– Interface Design
– Services Setup
• Evaluation and Applications
• Summary
10
TRB 87th Annual Meeting
Google-Map-Based Online Platform for Arterial Traffic Information and Analysis
11
Traffic Data from the City of Bellevue
• The city of Bellevue [Liang, 2006]
– 177 signalized intersections
– More than 840 advance detector
– Around 465 links (varied).
• Update info: 562 links as of 01/12/2008
Picture source: http://en.wikipedia.org/
TRB 87th Annual Meeting
Google-Map-Based Online Platform for Arterial Traffic Information and Analysis
13
Traffic Data
• All link data
– One minute update file (with all the links for
the flow map)
– Filename name: 0607121314.csv
Link ID
Link #
Smooth Occupancy
Smooth Volume
Cycle length
Plan # running
Color code
Incident code
TRB 87th Annual Meeting
Google-Map-Based Online Platform for Arterial Traffic Information and Analysis
14
Interface Design
Main Interface
Scatter Plot Analysis Tool
Time-Domain Analysis Tool
Other details, please refer to: Wu, Y. J., Y. Wang, D. Qian. A Google-Map-Based Arterial Traffic
Information System. Presented at 10th International IEEE Conference on Intelligent
Transportation Systems, Seattle, Washington, USA, 2007.
TRB 87th Annual Meeting
Google-Map-Based Online Platform for Arterial Traffic Information and Analysis
15
Services Setup
Clients
(Data users)
Traffic Engineers
STAR Lab
CSS
City of Bellevue
HTTP
XHTML
HTTP
Graphical
Library
Ajax
FTP
Researchers
HTTP
XML
Loop Controoler
PHP
Javascript
HTTP Web Server
Database Server
FTP Server
Data Server at the
Traffic Management Center
Loop Controoler
Google
Maps API
Travelers
Loop Controoler
TRB 87th Annual Meeting
Google-Map-Based Online Platform for Arterial Traffic Information and Analysis
Outline
•
•
•
•
Introduction
System Architecture
Implementation
Evaluation and Applications
– Real-Time and Historical Flow Map
– Time-Domain Analysis
– Intersection Performance Assessment
• Summary
16
TRB 87th Annual Meeting
Google-Map-Based Online Platform for Arterial Traffic Information and Analysis
Real-Time and Historical Flow Map
17
TRB 87th Annual Meeting
Google-Map-Based Online Platform for Arterial Traffic Information and Analysis
Time-Domain Analysis
• Snow Storm (January, 2007)
Main Interface
Scatter Plot Analysis Tool
Time-Domain Analysis Tool
18
TRB 87th Annual Meeting
Google-Map-Based Online Platform for Arterial Traffic Information and Analysis
Authorities warned that the storm would be
coming soon [1/9/2007]
Weather became better. Stall
vehicles removed
Roadway network was soon
covered by snow in the evening
and road users were warned
19
TRB 87th Annual Meeting
Google-Map-Based Online Platform for Arterial Traffic Information and Analysis
20
Intersection Performance Assessment
• Intersection 49 suffers congestion problems
during noon and afternoon peak hours
TRB 87th Annual Meeting
Google-Map-Based Online Platform for Arterial Traffic Information and Analysis
Critical Occupancy
21
TRB 87th Annual Meeting
Google-Map-Based Online Platform for Arterial Traffic Information and Analysis
Indexes
• Congestion Index
– the number of sample
points with an occupancy
value higher than the
critical occupancy divided
by the total number of
sample points.
• Utilization Index
– the average occupancy to
critical occupancy ratio
– if Oi > Oth, then Oi is set to
Oth.
22
TRB 87th Annual Meeting
Google-Map-Based Online Platform for Arterial Traffic Information and Analysis
Occ.
Vol.
(1) volume and occupancy scatter plot,
(2) the maximum volume within all sample points,
(3) average volume of the top 1% volume sample points,
(4) utilization index,
(5) critical occupancy value,
(6) congestion index,
(7) correlation coefficient,
(8) volume mean (volume standard deviation
(9) occupancy mean (occupancy standard deviation).
23
TRB 87th Annual Meeting
Google-Map-Based Online Platform for Arterial Traffic Information and Analysis
Timing Plan 43
• Designed for noon peak hours
– 11:16 AM to 1:46 PM during weekdays
24
TRB 87th Annual Meeting
Google-Map-Based Online Platform for Arterial Traffic Information and Analysis
Occ.
Vol.
(1) volume and occupancy scatter plot,
(2) the maximum volume within all sample points,
(3) average volume of the top 1% volume sample points,
(4) utilization index,
(5) critical occupancy value,
(6) congestion index,
(7) correlation coefficient,
(8) volume mean (volume standard deviation
(9) occupancy mean (occupancy standard deviation).
25
TRB 87th Annual Meeting
Google-Map-Based Online Platform for Arterial Traffic Information and Analysis
Demo
26
TRB 87th Annual Meeting
Google-Map-Based Online Platform for Arterial Traffic Information and Analysis
Summary
• Conclusion
– Cost-efficient system (MySQL, Apache server,
PHP, etc)
– A real-time traffic flow map for basic users
– A powerful analytical tool for advanced users
• Future work
– Route-wise or network-wise analysis tools
– Real-time route guidance
27
TRB 87th Annual Meeting
Google-Map-Based Online Platform for Arterial Traffic Information and Analysis
Questions?
Yao-Jan Wu
[email protected]
28