Maisha Mahmud ITS Lab Meeting Wednesday, March 19, 2008
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Transcript of Maisha Mahmud ITS Lab Meeting Wednesday, March 19, 2008
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Maisha MahmudITS Lab Meeting
Wednesday, March 19, 2008
Using Existing ITS Commercial Vehicle Operation (ITS/CVO) Data to Develop Statewide (and Bi-state) Truck Travel Time Estimates and Other Freight Measures
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Project Objective
•Study the feasibility of using transponder data from commercial vehicles to predict corridor travel times with existing infrastructure •Retrospectively study truck transponder data in key corridors to determine the feasibility of producing freight corridor performance measures.
WINTER PASS DRIVING UPDATES Thursday, Jan. 31, 11:45 a.m. DESCRIPTION: I-84, one of the primary east-west routes through northern Oregon, is closed from Pendleton, Oregon to Ontario, Oregon, which are both east of the interchange of I-82 and I-84.
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Project Background
Oregon Green Light
20 active reporting WIM stations 4,013 trucking companies 40,606 trucks equipped with
transponders enrolled in the preclearance program (March 08)
These WIM stations provide: Gross Vehicle Weight Axle Weight Spacing Transponder Tags
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Stations
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Preliminary analysis
Why we need preliminary analysis?Large data set (20 GB)Data from 2005-currentWealth of information like GVW, Speed, axle load, axle spacing, etc, need close observation.Find how many trucks have tag, of them % valid match,% outside match.How many times a single tag repeated within a single station.Find how truck choose their possible routes within a corridor and estimate their travel time.Finally set a logic for possible matching.
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Test corridor– I-84 WB Stations: Farewell Bend, Emigrant Hill, Wyeth Analysis duration: February 2007 Methodology:
First checked how many trucks have tag in each station. Clean data for without tag Make them unique by adding Tag_Day_Month. Remove duplicate tags at each station Matched the tag between adjacent stations and all three
stations. Calculated travel time.
Preliminary Analysis, Feb 2007
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Highest number of observations of an individual tag at a station: 82 times in Wyeth for a month.
Duplicate tags between stations
Farewell Bend-2%
Emigrant Hill -2%
Wyeth-5%
Stations Truck with Tag Non Tag
Farewell Bend 38% 62%
Emigrant Hill 44% 56%
Wyeth 48% 52%
Preliminary Analysis, Feb 2007
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Farewell Bend
Emigrant HillWyeth
Preliminary Analysis, Feb 2007
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1:50
2:34
3:19
4:04
4:48
5:33
6:18
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7:47
8:32
9:17
10:0
210
:46
11:3
112
:16
13:0
013
:45
14:3
015
:15
Fre
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Travel Time
Farewell Bend To Emigrant Hill Travel TimeHistogram
Mean Travel Time 2 hour 36 minMedian Travel Time 2 hour 22 minFree flow travel time 2 hourstandard deviation=5%
Preliminary Analysis, Feb 2007
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10:3
111
:40
12:4
913
:58
15:0
716
:15
17:2
418
:33
19:4
220
:50
Freq
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Travel Time
Emigrant Hill To Wyeth Travel Time Histogram
Mean Travel Time 3 hour 53 min Median Travel time 3 hour 22 minFree Flow Travel Time 2 hour 50 minStandard deviation=7%
Preliminary Analysis, Feb 2007
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4:35
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:07
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:17
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:26
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:35
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922
:54
Freq
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Travel Time
Farewell Bend to Wyeth Travel Time Histogram
Mean Travel Time 6 hour 22 minMedian Travel Time 5 hour 51 minFree Flow Travel Time 5 hourStandard Deviation= 7%
Preliminary Analysis, Feb 2007
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Preliminary Analysis, Feb 2007
?
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Farewell Bend POE I-84 WB, MP 353.31
Emigrant Hill, I-84 WB, MP 226.95
Wyeth, I-84 WB, MP 54.3,
Juniper Butte, US-97 SB, MP 108.2
Klamath Falls (SB), US-97 SB, MP 271.41
Brightwood, US-26 WB, MP 36.31
Lowell, US-58 WB, MP 17.17
2h
Wilbur, I-5 SB, MP 130
Ashland, I-5 SB, MP 18.08
Woodburn, I-5 SB, MP 274.18
Wilbur, I-5 SB, MP 130
Ashland, I-5 SB, MP 18.08
Woodburn, I-5 SB, MP 274.18
Wilbur, I-5 SB, MP 130
Ashland, I-5 SB, MP 18.08
1h20m
2h30m
2h
1h10m
2h
1h
2h30m
2h
4h2h50
1h40m
2h30m
1h10m
Washington
2h50m
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Probable Algorithm
•Check if truck have tag/transponder within a station•If truck have tag make it “tag_day_month”•Check if tag_day_month (station1) match with tag_day_month (station 2)•If count (match)=1•Get travel time= station 2 (travel time)-station1(travel time)•If count(match)>1•Exclude(count)•End.
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Some Freight Measures
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2004 9 14
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GVW
Matched Tag Gross Vehicle Weight Histogram
Farewell Bend
EmigrantHill
Wyeth
Gross vehicle weight variation and loading distribution between these three station with matched tag.
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Questions?