Cellular Probes
Kansas City Evaluation
Cellular ProbeFeasibility StudyCellular Probe
Feasibility Study
Cellular Probes
Kansas City Evaluation
Cellular ProbeFeasibility Study
Project Background
Cellular Probes
Kansas City Evaluation
Cellular Probe Feasibility Study
Overview
• Project History
• Project Team– Kansas Department of Transportation– Cellint– Kansas City Scout– Telvent Farradyne
• Project Funding
Cellular Probe Feasibility Study
KDOT Goals
• Determine the general feasibility of the cell probe technology.
• Determine possible applications for the cell probe average speed data.– Incident detection– Speed mapping– Travel times– Performance measures
Cellular Probe Feasibility Study
Project Timeline
• January 2006 – Discussions begin between KDOT and Cellint.
• February 2006 – Scout begins providing speed data to Cellint.
• March 2006 – Cellint creates a website with speed bands.
Cellular Probe Feasibility Study
Project Timeline (Cont.)
• June through August, 2006 – Cellint provides blind speed data along the I-435 study corridor.
• Winter 2006/2007 – Scout analyzes the blind test data and produces a preliminary report.
• Summer 2007 – Final report to be completed.
Cellular Probes
Kansas City Evaluation
Cellular ProbeFeasibility Study
Data Analysis
Cellular Probes
Kansas City Evaluation
Cellular Probe Feasibility Study
Analysis Overview
• General Feasibility Analysis
Review how the Cellint speed bands change during accidents and construction lane closures.
• Detailed Speed Data Analysis
Cellint provides blind cell probe speed data so Scout can perform an independent study.
Cellular Probe Feasibility Study
Cellular Probe Feasibility Study
Cellular Probe Feasibility Study
Cellular Probes
Kansas City Evaluation
Cellular ProbeFeasibility Study
Methodology
Cellular Probes
Kansas City Evaluation
Cellular Probe Feasibility Study
Approach
• Slowdown analysis– Use two algorithms– Identify slowdowns– Match slowdowns– Compare results (percent matched,
average lag)
Cellular Probe Feasibility Study
Frequency Distribution of Slowdowns by Start Time and Data Source(I-435, all study sites, all days)
0 0 1649
14 022 11
146
2356
28 29
100
355 362
050
100150200250300350400
Num
ber o
f Slo
wdo
wns
Cellint Data
Scout Data
Cellular Probe Feasibility Study
Comparison of Cellint Data with Scout VDS DataI-435 EB at WORNALL RD (mp 18.79)
(06/21/2006 : Cellint Section 26 : Scout VDS ID 136 : 5.0 min interval)
0.010.020.030.040.050.060.070.080.0
12:0
0 A
M
1:00
AM
2:00
AM
3:00
AM
4:00
AM
5:00
AM
6:00
AM
7:00
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0 A
M
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0 A
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10:0
0 P
M
11:0
0 P
M
12:0
0 A
M
Cellular Probe Feasibility Study
Comparison of Cellint Data with Scout VDS DataI-435 EB at WORNALL RD (mp 18.79)
(07/18/2006 : Cellint Section 26 : Scout VDS ID 136 : 5.0 min interval)
0.010.020.030.040.050.060.070.080.0
12:0
0 A
M
1:00
AM
2:00
AM
3:00
AM
4:00
AM
5:00
AM
6:00
AM
7:00
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10:0
0 A
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0 A
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0 P
M
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10:0
0 P
M
11:0
0 P
M
12:0
0 A
M
Cellular Probe Feasibility Study
Comparison of Cellint Data with Scout VDS DataI-435 EB at WORNALL RD (mp 18.79)
(08/11/2006 : Cellint Section 26 : Scout VDS ID 136 : 5.0 min interval)
0.010.020.030.040.050.060.070.080.0
12:0
0 A
M
1:00
AM
2:00
AM
3:00
AM
4:00
AM
5:00
AM
6:00
AM
7:00
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8:00
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10:0
0 A
M
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0 A
M
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0 P
M
1:00
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10:0
0 P
M
11:0
0 P
M
12:0
0 A
M
Cellular Probe Feasibility Study
Comparison of Cellint Data with Scout VDS DataI-435 EB at WORNALL RD (mp 18.79)
(06/21/2006 : Cellint Section 26 : Scout VDS ID 136 : 5.0 min interval)
0.010.020.030.040.050.060.070.080.0
12:0
0 A
M
1:0
0 A
M
2:0
0 A
M
3:0
0 A
M
4:0
0 A
M
5:0
0 A
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0 A
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0 A
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0 A
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0 A
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10:0
0 A
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11:0
0 A
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12:0
0 P
M
1:0
0 P
M
2:0
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3:0
0 P
M
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0 P
M
5:0
0 P
M
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0 P
M
7:0
0 P
M
8:0
0 P
M
9:0
0 P
M
10:0
0 P
M
11:0
0 P
M
12:0
0 A
M
Comparison of Cellint Data with Scout VDS DataI-435 EB at WORNALL RD (mp 18.79)
(07/18/2006 : Cellint Section 26 : Scout VDS ID 136 : 5.0 min interval)
0.010.020.030.040.050.060.070.080.0
12:0
0 A
M
1:0
0 A
M
2:0
0 A
M
3:0
0 A
M
4:0
0 A
M
5:0
0 A
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6:0
0 A
M
7:0
0 A
M
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0 A
M
9:0
0 A
M
10:0
0 A
M
11:0
0 A
M
12:0
0 P
M
1:0
0 P
M
2:0
0 P
M
3:0
0 P
M
4:0
0 P
M
5:0
0 P
M
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0 P
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M
8:0
0 P
M
9:0
0 P
M
10:0
0 P
M
11:0
0 P
M
12:0
0 A
M
Comparison of Cellint Data with Scout VDS DataI-435 EB at WORNALL RD (mp 18.79)
(08/11/2006 : Cellint Section 26 : Scout VDS ID 136 : 5.0 min interval)
0.010.020.030.040.050.060.070.080.0
12:0
0 A
M
1:0
0 A
M
2:0
0 A
M
3:0
0 A
M
4:0
0 A
M
5:0
0 A
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0 A
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0 A
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9:0
0 A
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10:0
0 A
M
11:0
0 A
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1:0
0 P
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Cellular Probe Feasibility Study
Approach
• Category analysis– Binned speeds (from ATMS)
• <25mph (red)• 25-35mph (yellow)• >35mph (green)
– Compared bin for each time interval– R=R, Y=Y, and (R+Y)=(R+Y)
Cellular Probe Feasibility Study
Non-GG MatchesI-435 EB at 104TH ST (mp 17.19)
0%5%
10%15%
20%25%30%35%
0 5 10 15 20
Assumed Offset (minutes)
Pe
rce
nt
Ma
tch
ed
Y Matches + R Matches
(Y+R) Matches
Cellular Probes
Kansas City Evaluation
Cellular ProbeFeasibility Study
Conclusions
Cellular Probes
Kansas City Evaluation
Cellular Probe Feasibility Study
Advantages
• No ROW required
• No FTEs required
• No DOT maintenance required
• Public-private partnerships
• Continuous coverage– Smart Work Zones
• Direct measure of travel times
Cellular Probe Feasibility Study
Caveats
• Time lag– 3 to 12 min
• Congestion sensitivity– Why?– Pro or con?– Market saturation dependant?
• Volume sensitivity
Cellular Probe Feasibility Study
Summary
• Not for all applications…ATISTravel times Incident detectionPerformance measures
Cellular Probe Feasibility Study
Summary
• Viable technology– Clearly reflects traffic
• Growing data source
• Young technology
Cellular Probes
Kansas City Evaluation
Cellular Probes
Kansas City Evaluation
K. Mark SommerhauserKansas City [email protected]
Eric Meyer, P.E., PhDTelvent Farradyne [email protected]
K. Mark SommerhauserKansas City [email protected]
Eric Meyer, P.E., PhDTelvent Farradyne [email protected]
Cellular Probe Feasibility StudyCellular Probe Feasibility Study