The Practical Side of Cell Phones as Traffic Probes Dr. Richard Mudge, Delcan-NET October 10, 2005 The information contained in this document is considered.

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Presentation transcript:

The Practical Side of Cell Phones as Traffic Probes Dr. Richard Mudge, Delcan-NET October 10, 2005 The information contained in this document is considered proprietary, and may not be reproduced or redistributed without the consent of Delcan Inc.

Cell Probe Technology  Part of general trend away from fixed sensors toward vehicle-based information  Reflects frustration with high costs and slow pace of deployment for traditional sensors  More than just ITS - a broad management and planning tool (see NCHRP report)  Characteristics: Low cost full regional coverage performance-based, and self sufficient business model

Cell Probe Technology  Practical success requires more than cell phones  Cell phone movement based on cell location and “hand-offs” from one cell to another  Pattern recognition techniques filter out data from those not on the highway  Then traffic algorithms generate travel times and speeds on roadway links  Cell phones need to be turned on, but not necessarily in use  Full regional systems in place in Baltimore, Antwerp, and Tel Aviv = 4,600 miles

Cell Probe Technology

Cell Probe Privacy

Handset 49, part 1

Handset 49, part 2

Handset 49, part 3

Handset 49, part 4

Handset 49, part 5

Handset 49, part6

Handset 49, full trip

Path-Finding Drive Tests

Baltimore MMTIS  Provides first regional deployment of commercial-quality cellular traffic probes in North America  Mutually profitable public-private partnership Test commercial markets during project Integrate with existing public data – including transit and E-911 Encourage public applications beyond traditional ITS  Contract signed September 2004; data flow to Maryland DOT began April 2005

Baltimore MMTIS – Private Firms  Delcan-NET Transportation and technology consultants Fifty plus years in business Profitable every year; staff = 500 plus  ITIS Holdings Leader in traffic probes; staff = 100 Commercial customers – 16 automobile firms, for-profit 511 Profitable! Publicly traded on London exchange  National cellular firms

MARYLAND DOT CAMERAS SHOW ACCURACY OF TRAFFIC INFORMATION BEING CAPTURED USING CELL PROBES I-695 at HARTFORD ROAD Monday, June 6 th :02:18 am

I-695 at HARTFORD ROAD Monday, June 6 th :33:06 am CELL PROBES ACCURATELY UPDATE TRAFFIC CONDITIONS AS CHANGES OCCUR

Produced by Dr Hillel Bar Gerd, Associate Professor, Ben Gurion Negev University, Israel

Baltimore Comparison with RTMS Data

Analysis Route Overview

Performance data I-695 – July 2005

Baltimore I-695 Weekday Patterns

Baltimore I-695 Saturday Patterns

Baltimore I-695 Route Travel Time

Beyond Baltimore  Delcan-NET/ITIS selected to negotiate with Missouri DOT Statewide system -- 5,500 miles  St. Louis, Kansas City, all Interstates plus important rural roads  Completion within six months  Emphasis on performance measures and operations  Conversations with other DOTS

Possible Applications  Travel Times For message signs; web sites  Performance measures Include arterial network “Top 10” routes TTI-type reports  Operations planning Special events Work zone management Evaluation of actions  Safety Focus on problem areas and assessments  Port/intermodal access  Local/regional web sites  Statewide coverage

Applications  General Planning and Management Regional congestion management Archived data supports system analysis, ”average day” information, long-range planning Integrated regional or corridor management Plan for “extreme” or special events Homeland security applications – no-notice evacuations Rapid evaluation of alternatives Work zone management Rural planning and operations Traffic volume estimates -- future

Applications (2)  Performance Measurement System performance in near real time Reliability measures – critical from user’s perspective (travel time index, planning time index, etc.) Performance-based systems – information for operators, users, and the public Congestion management – support for HOT lanes and other finance alternatives Economic value from partnerships with business – the DOT a part of just in time delivery

Applications (3)  Travel Demand and Air Quality Modeling Today – Validate travel demand and Mobile6 models Tomorrow – origin/destination data Tomorrow – New model development: activity-based and beyond  Safety Analysis and prediction Targeted deployment of safety personnel  Communication Public participation – real data on congestion Near real-time data – web, PDA, 511 Premium 511 service

Applications (4)  Freight Operations Web- or cell-based distribution of roadway information Individual dynamic routing recommendations based on congestion Travel time prediction to improve asset utilization  Freight Analytics Strategic analysis of freight movement for congestion mitigation Origin/destination data to examine flows and set priorities Support for cost/benefit and alternatives analysis

Appendix  Safety application  Some validation results

Safety Example  Operational tool Assign patrol cars to road segments based on:  Average speed – Z percent above speed limit  Trigger points – X percent of traffic more than Y percent above speed limit Identify trends and historical patterns Short-term forecasts  Evaluation tool – near real-time Assess what worked and how well Statistical analysis of patterns

Safety Example Speed Limit

Distribution of Speeds Speed Limit Safety Example

Validation results  Tel Aviv system – Dr. Hillel Bar Gerd, Associate Professor, Ben Gurion Universityev University, Israel “The main conclusion of this experiment is that in most cases all three methods (floating vehicle, loop detectors, and the cellular system) provide very similar travel time estimates. In that respect, the cellular system is a reliable method for travel time measurements, suitable for many practical applications.”

Produced by Dr Hillel Bar Gerd, Associate Professor, Ben Guion Negev University, Israel

Comparison to GPS Loop detectors CFVD™ 0.90 min0.49 minBias 1.13 min1.25 minRMS 1.44 min1.34 minAccuracy SQRT(Bias 2 +RMS 2 ) Produced by Dr Hillel Bar Gerd, Associate Professor, Ben Guion Negev University, Israel