developing a bus service reliability evaluation and visualization framework using archived avl/apc...
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Developing a Bus Service Reliability Evaluation and
Visualization Framework Using Archived AVL/APC Data
Wei Feng
Dr. Miguel Figliozzi
Portland State University
6/27/2012
1
Outline
• Background
• Motivation
• Objective
• Data description and route configuration
• Performance measures and visualization examples
• Summary
• Future work
2
Background
• PORTAL (Portland Oregon Regional Transportation Archive Listing) it is a multi-modal transportation data archive and web-based visualization system.
• Transit data are complicated and difficult to manipulate and have not been incorporated into Portal yet.
• TriMet is going to upgrade the existing bus dispatching system with higher resolution AVL data.
3
• Service reliability is important for both transit agencies and passengers
• Under utilization of large amount of (Automatic vehicle location) AVL and (Automatic passenger counter) APC data
• Reduce research overlap
Motivation
4
• Develop a bus service reliability evaluation and visualization framework that can convert large amount of AVL, APC data into valuable information and performance measures with visual aids
Objective
5
Performance measures
• Aggregated (certain time of day over multiple days) identify recurrent problems
• Disaggregated operational records (specific date and time of day) examine more detail information
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Route configuration
7
WB
F
E
D
B
C
A
Leve
l of
Ser
vice
Sca
le
On-time performance (WB)
Hou
rs
1
0.95
0.9
0.85
0.8
0.75
0.7
0.65
0.6
0.55
0.55
Aggregated
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Schedule adherence between 11am and 12am (WB)
On – time thresholdmedian
25% quartile
75% quartile
Sample maximum
Sample minimum
Outliers+
Act
ual–
sch
edul
e de
part
ure
time
(sec
onds
)
Schedule deviations between 11am and 12 pm (WB)
West
Aggregated
9
headway frequency AM peak hours (WB)
Fre
quen
cy
West
Aggregated
10
West
Series1
-30%
-25%
-20%
-15%
-10%
-5%
0%
5%
10%
15%
20%Bus bunching formation and dissipation (WB am peak)
Finally recoveredFirst bunched
Aggregated
11
0
1
2
3
4
5
6average passenger waiting time spatial distribution (Westbound am peak hours)
SW
Mo
rris
on
& 1
7th
SW
Wa
shin
gto
n &
5th
SE
Mo
rris
on
& 1
2th
SE
Be
lmo
nt &
39
th
SE
Be
lmo
nt &
60
th
SE
Sta
rk &
82
nd
SE
Sta
rk &
93
rd
ave
rag
e w
aiti
ng
tim
e (
min
ute
s)
leading bus avg waiting timefollowing bus avg waiting timenormal bus avg waiting timebunching bus avg waiting time
West
Aggregated
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06:30 07:00 07:30 08:00 08:30 09:00 09:30
Gateway Transit Center / 0
SE Stark & 93nd / 2.7
SE Stark & 82nd / 3.3
SE Belmont & 60th / 4.6
SE Belmont & 39th / 5.6
SE Morrison & 12th / 7.2
SW Washington & 5th / 8.3
SW Morrison & 17th / 9.1
NW 23rd & Lovejoy / 10.0
Time points / distance (miles)time space diagram on16-Sep-2009 between 06:30 and 09:30 (Route 15 Westbound)
10501060107010801090110011101120113011401150116011701180119012001210122012301240125012601270128012901300131013201330134013501360137013801390
West
Time space diagram
Disaggregated
13
Summary
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• Route level bus service reliability evaluation and visualization are helpful to transit agencies
• Aggregated reliability performance measures are helpful for recurrent problems
• Disaggregated performance visualization can help understand particular causes
• Integrate all these performance measures and visual aids with Portlal
• Extend the same algorithm to all other routes in TriMet
• Upgrade with new TriMet Bus dispatching system data
Future work
16
• Steve Callas and David Court (TriMet)
• OTREC (Oregon Transportation Research and Education Consortium)
• Eric Albright, Scott Price (ITS Lab at PSU)
Acknowledgement
17
Route 9 dynamic visualization: http://web.cecs.pdx.edu/~eea/trimetViz/tspviz.phpPortal official: http://portal.its.pdx.edu/home/Portal demo: http://demo.portal.its.pdx.edu/Portal/index.php/pedbikeTriMet: http://ride.trimet.org/?tool=routes
Wei FengEmail: [email protected]: http://web.cecs.pdx.edu/~wfeng/
Dr. Miguel FigliozziEmail: [email protected]: http://web.cecs.pdx.edu/~maf/
Thank you
Questions?
20
Data description
Date Leave_time Train Stop
_timeArrive_time Dwell Stop_id Door Lift ons offs Load Mileage
9/14/2009 21150 1501 21120 21136 0 8989 0 0 0 0 2 8.19/14/2009 21216 1501 21194 21182 10 7162 1 0 2 0 4 8.39/14/2009 21262 1501 21248 21238 7 8963 1 0 2 1 5 8.59/14/2009 21294 1501 21286 21278 0 7174 0 0 0 0 5 8.69/14/2009 21344 1501 21327 21320 6 718 2 0 1 0 6 8.79/14/2009 21384 1501 21373 21360 0 749 0 0 0 0 6 8.89/14/2009 21430 1501 21407 21394 5 8511 1 0 1 0 8 8.99/14/2009 21496 1501 21480 21472 8 6911 2 0 0 1 7 9.19/14/2009 21590 1501 21575 21582 0 5016 0 0 0 0 7 9.39/14/2009 21636 1501 21611 21602 0 5014 0 0 0 0 7 9.4… … … … … … … … … … … … …
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