Cellular Probes Kansas City Evaluation Cellular Probe Feasibility Study Cellular Probe Feasibility...

Cellular Probes

Kansas City Evaluation

Cellular ProbeFeasibility StudyCellular Probe

Feasibility Study

Cellular Probes


Cellular ProbeFeasibility Study

Project Background

Cellular Probes


Cellular Probe Feasibility Study

Overview

• Project History

• Project Team– Kansas Department of Transportation– Cellint– Kansas City Scout– Telvent Farradyne

• Project Funding


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


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.


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



Data Analysis

Cellular Probes



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 Probes



Methodology

Cellular Probes



Approach

• Slowdown analysis– Use two algorithms– Identify slowdowns– Match slowdowns– Compare results (percent matched,

average lag)


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


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)

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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)


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

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tch

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Y Matches + R Matches

(Y+R) Matches

Cellular Probes



Conclusions

Cellular Probes



Advantages

• No ROW required

• No FTEs required

• No DOT maintenance required

• Public-private partnerships

• Continuous coverage– Smart Work Zones

• Direct measure of travel times


Caveats

• Time lag– 3 to 12 min

• Congestion sensitivity– Why?– Pro or con?– Market saturation dependant?

• Volume sensitivity


Summary

• Not for all applications…ATISTravel times Incident detectionPerformance measures


Summary

• Viable technology– Clearly reflects traffic

• Growing data source

• Young technology

Cellular Probes


Cellular Probes


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

Cellular Probes Kansas City Evaluation Cellular Probe Feasibility Study Cellular Probe Feasibility...

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