Benjamin Coifman's publications

Ben's Civil Engineering page
Ben's Electrical Engineering page
Traffic Monitoring Laboratory


SELECTED PUBLICATIONS


Coifman, B., "Jam Occupancy and Other Lingering Problems with Empirical Fundamental Relationships," Transportation Research Record, [in press]. [PDF draft]

Wu, L., Coifman, B., "Vehicle Length Measurement and Classification in Congested Freeway Traffic," Transportation Research Record, [in press]. [PDF draft]

Coifman, B., Neelisetty, S., "Improved Speed Estimation from Single Loop Detectors with High Truck Flow," Journal of Intelligent Transportation Systems, [in press]. [PDF draft]

Thornton, D., Redmill, K., Coifman, B., "Automated Parking Surveys from a LIDAR Equipped Vehicle," Transportation Research- Part C, Vol 39, 2014, pp 23-35. [PDF draft]

Kim, S., Coifman, B., "Evaluation of Axle-Based and Length-Based Vehicle Classification Stations," Transportation Research Record 2339, 2013, pp 1-12. [PDF draft]

Kim, S., Coifman, B., "Driver Relaxation Impacts on Bottleneck Activation, Capacity, and the Fundamental Relationship," Transportation Research- Part C, Vol 36, 2013, pp 564-580. [PDF draft]

Wei, H., Liu, H., Ai, Q., Li, Z., Xiong, H., Coifman, B., "Empirical Innovation of Computational Dual-Loop Models for Identifying Vehicle Classifications against Varied Traffic Conditions." Computer-Aided Civil and Infrastructure Engineering, Vol 28, No 8, 2013, pp 621-634.

Lee, H., Coifman, B., "Side-Fire LIDAR Based Vehicle Classification," Transportation Research Record 2308, 2012, pp 173-183. [PDF draft]

Xuan, Y., Coifman, B., "Identifying Lane Change Maneuvers with Probe Vehicle Data and an Observed Asymmetry in Driver Accommodation," Journal of Transportation Engineering, ASCE, Vol 138, No 8, 2012, pp 1051-1061. [PDF draft]

Lee, H., Coifman, B., "An Algorithm to Identify Chronic Splashover Errors at Freeway Loop Detectors," Transportation Research-Part C, Vol 24, 2012, pp 141-156. [PDF draft]

Lee, H., Coifman, B., "Quantifying Loop Detector Sensitivity and Correcting Detection Problems on Freeways," Journal of Transportation Engineering, ASCE, Vol. 138, No. 7, 2012, pp 871-881. [PDF draft]

Lee, H., Coifman, B., "Identifying and Correcting Pulse-Breakup Errors from Freeway Loop Detectors," Transportation Research Record 2256, 2011, pp 68-78. [PDF draft]

Coifman, B., Kim, S., "Extended Bottlenecks, the Fundamental Relationship and Capacity Drop," Transportation Research- Part A. Vol 45, No 9, 2011, pp 980-991. [PDF draft]

Coifman, B., Kim, S., "Measuring Freeway Traffic Conditions with Transit Vehicles," Transportation Research Record 2121, Transportation Research Board, 2009, pp 90-101. [PDF draft]

Coifman, B., Kim, S. "Speed Estimation and Length Based Vehicle Classification from Freeway Single Loop Detectors," Transportation Research Part-C, Vol 17, No 4, 2009, pp 349-364. [PDF draft]

Tong, D., Merry, C., Coifman, B. "New Perspectives on the Use of GPS and GIS to Support a Highway Performance Study," Transactions in GIS, Vol 13 No 1, 2009, pp 69-85.

Wang, C., Coifman, B., "The Effect of Lane Change Maneuvers on a Simplified Car-following Theory," IEEE Transactions on Intelligent Transportation Systems, Vol 9, No 3, 2008, pp 523-535. [PDF draft]

Coifman, B., Krishnamurthy, S., "Vehicle Reidentification and Travel Time Measurement Across Freeway Junctions Using the Existing Detector Infrastructure," Transportation Research- Part C, Vol 15, No 3, 2007, pp135-153. [PDF draft]

Coifman, B., Mallika, R., "Distributed Surveillance on Freeways Emphasizing Incident Detection and Verification," Transportation Research Part A, Vol 41, No 8, 2007, pp750-767. [PDF draft]

Coifman, B., Mishalani, R., Wang, C., Krishnamurthy, S., "A Pilot Study into the Impacts of Lane Change Maneuvers on Congested Freeway Segment Delays," Transportation Research Record 1965, 2006, pp152-159. [PDF draft]

Lang, L, Coifman, B., "Identifying Lane Mapping Errors at Freeway Detector Stations," Transportation Research Record 1945, 2006, pp89-99. [PDF draft]

Coifman, B., McCord, M., Mishalani, R., Iswalt, M., Ji,, Y., "Roadway Traffic Monitoring from an Unmanned Aerial Vehicle", IEE Journal on Intelligent Transport Systems, (inaugural issue), Vol 153, No 1, 2006, pp 11-20. [PDF draft]

Coifman, B., "Vehicle Level Evaluation of Loop Detectors and the Remote Traffic Microwave Sensor," ASCE Journal of Transportation Engineering. Volume 132, No 3, 2006, pp 213-226. [PDF draft]

Coifman, B., "Freeway Detector Assessment- Aggregate Data from the Remote Traffic Microwave Sensor (RTMS)," Transportation Research Record 1917, 2005, pp149-163. [PDF draft]

Jain, M., Coifman, B., "Improved Speed Estimates from Freeway Traffic Detectors," ASCE Journal of Transportation Engineering, Vol 131, No 7, 2005, pp483-495. [PDF draft]

Coifman, B., Yang, Y., "Estimating Spatial Measures of Roadway Network Usage from Remotely Sensed Data," Transportation Research Record 1870, 2004, pp133-138. [PDF draft]

Coifman, B., Dhoorjaty, S., "Event Data Based Traffic Detector Validation Tests", ASCE Journal of Transportation Engineering, Vol 130, No 3, 2004, pp 313-321. [PDF draft]

McCord, M., Yang, Y., Jiang, Z., Coifman, B., Goel, P. "Estimating AADT from Satellite Imagery and Air Photos: Empirical Results", Transportation Research Record 1855, 2003, pp 136-142.

Coifman, B. "Estimating Density and Lane Inflow on a Freeway Segment", Transportation Research: Part A, vol 37, no 8, 2003, pp 689-701. [PDF draft]

Coifman, B., Ergueta, E., "Improved Vehicle Reidentification and Travel Time Measurement on Congested Freeways", ASCE Journal of Transportation Engineering, Vol 129, No 5, 2003, pp 475-483.

Coifman, B., Dhoorjaty, S., and Lee, Z. "Estimating Median Velocity Instead of Mean Velocity at Single Loop Detectors", Transportation Research: Part C, vol 11, no 3-4, 2003, pp 211-222. [PDF draft]

Coifman, B. "Identifying the Onset of Congestion Rapidly with Existing Traffic Detectors", Transportation Research: Part A, vol 37, no 3, 2003, pp. 277-291. [PDF draft]

Coifman, B., and Cassidy, M. "Vehicle Reidentification and Travel Time Measurement on Congested Freeways", Transportation Research: Part A, 2002, vol 36, no 10, 2002, pp. 899-917. [PDF draft]

Coifman, B. "Estimating Travel Times and Vehicle Trajectories on Freeways Using Dual Loop Detectors", Transportation Research: Part A, 2002, vol 36, no 4, 2002, pp. 351-364. [PDF draft]

Coifman, B. "Improved Velocity Estimation Using Single Loop Detectors", Transportation Research: Part A, vol 35, no 10, 2001, pp. 863-880. [PDF draft]

Kwon, J., Coifman, B., and Bickel, P. "Day-to-Day Travel Time Trends and Travel Time Prediction from Loop Detector Data", Transportation Research Record no. 1717, Transportation Research Board, 2000, pp 120-129. [PDF draft]

Coifman, B. "Using Dual Loop Speed Traps to Identify Detector Errors", Transportation Research Record no. 1683, Transportation Research Board, 1999, pp 47-58. [PDF draft]

Coifman, B., Beymer, D., McLauchlan, P., and Malik, J. "A Real-Time Computer Vision System for Vehicle Tracking and Traffic Surveillance", Transportation Research: Part C, vol 6, no 4, 1998, pp 271-288. [PDF draft]

Coifman, B. "Vehicle Reidentification and Travel Time Measurement in Real-Time on Freeways Using the Existing Loop Detector Infrastructure", Transportation Research Record no. 1643, Transportation Research Board, 1998, pp 181-191. [PDF draft]

Cassidy, M., and Coifman, B. "The Relation Between Average Speed, Flow and Occupancy and the Analogous Relation Between Density and Occupancy", Transportation Research Record no. 1591, Transportation Research Board, 1997, pp 1-6.

Coifman, B. "A New Methodology for Smoothing Freeway Loop Detector Data: an Introduction to Digital Filtering", Transportation Research Record no. 1554, Transportation Research Board, 1996, pp 142-152.

Chira-Chavala, T., and Coifman, B. "Effects of Smart Cards on Transit Operators", Transportation Research Record no. 1521, Transportation Research Board, 1996, pp 84-90.

Chira-Chavala, T., Coifman, B., Porter, C., and Hansen, M. "Light Rail Accident Involvement and Severity", Transportation Research Record no. 1521, Transportation Research Board, 1996, pp 147-155.



SELECTED CONFERENCE PROCEEDINGS

Redmill, K., Coifman, B., McCord, M., Mishalani, R., "Using Transit or Municipal Vehicles as Moving Observer Platforms for Large Scale Collection of Traffic and Transportation System Information," The 14th International IEEE Conference on Intelligent Transportation Systems, Oct 5-7, 2011, Washington, DC.

Wang, C., Coifman, B., "Estimating the Number of Lane Change Maneuvers on Congested Freeway Segments," Proc. of the 11th World Conference on Transport Research, June, 28, 2007, Berkeley, CA. [PDF draft]

Xuan, Y., Coifman, B., "Lane Change Maneuver Detection from Probe Vehicle DGPS Data," Proc. of the 9th IEEE International Conference on Intelligent Transportation Systems, Toronto, Canada, September 17-20, 2006. [PDF draft]

Gao, B., Coifman, B., "Vehicle Identification and GPS Error Detection from a LIDAR Equipped Probe Vehicle," Proc. of the 9th IEEE International Conference on Intelligent Transportation Systems, Toronto, Canada, September 17-20, 2006.

McCord, M., Mishalani, R., Coifman, B, Ji, Y., Iswalt, M., "Determining Origin-Destination Flows across a Two-Intersection Network From Non-Overlapping UAV and Ground-Based Imagery", Proc. of Applications of Advanced Technology in Transportation, ASCE, August 13-16, 2006, Chicago, IL.

Coifman, B., and Wang, Y., "Average Velocity of Waves Propagating Through Congested Freeway Traffic," Proc. of The 16th International Symposium on Transportation and Traffic Theory, July 19-21, 2005, College Park, MD. pp 165-179. [PDF draft]

Gao, B., Coifman, B., "Extracting traffic flow characteristics with an instrumented probe vehicle" Proc. of Traffic and Granular Flow 2005, Berlin, Germany, October 10-12, 2005, Springer, 2007, pp 675-685. [PDF draft]

Coifman, B., McCord, M., Mishalani, M., Redmill, K., "Surface Transportation Surveillance from Unmanned Aerial Vehicles" Proc. of the 83rd Annual Meeting of the Transportation Research Board, 2004. [PDF draft]

Coifman, B., Krishnamurthy, S., Wang, X., "Lane Change Maneuvers Consuming Freeway Capacity", Proc. of the Traffic and Granular Flow 2003 Conference, October 3, 2003, Delft, Netherlands, pp 3-14. [PDF draft]

Mishalani, R., Coifman, B., Gopalakrishnan, D. "Evaluating Real-Time Origin-Destination Flow Estimation Using Remote Sensing Based Surveillance Data", Proc. of the 6th International Applications of Advanced Technologies in Transportation Engineering, ASCE, Cambridge, MA, August 2002, pp 640-647.

Jia, Z., Chen, C., Coifman, B. and Varaiya, P. "The PeMS algorithms for accurate, real-time estimates of g-factors and speeds from single-loop detectors", Proc. IEEE ITS Council Annual Meeting, IEEE, 2001, pp 536-541.

Coifman, B., Lyddy, D., and Sabardonis, A. "The Berkeley Highway Laboratory- Building on the I-880 Field Experiment", Proc. IEEE ITS Council Annual Meeting, IEEE, 2000, pp 5-10. [PDF draft]

Coifman, B. "A New Algorithm for Vehicle Reidentification and Travel Time Measurement on Freeways", Proc. of the 5th International Applications of Advanced Technologies in Transportation Engineering, ASCE, 1998, pp 167-174. [PDF draft]

Beymer, D., McLauchlan, P., Coifman, B., and Malik, J. "A Real-Time Computer Vision System for Measuring Traffic Parameters", Proc. IEEE - Computer Vision and Pattern Recognition, IEEE, 1997, pp 495-501.

Coifman, B. "IVHS Protection at Light Rail Grade Crossings", Proc. 1995 IEEE/ASME Joint Railroad Conference, IEEE, 1995, pp 39-45.



OTHER SELECTED REPORTS AND PUBLICATIONS

May, A., Coifman, B., Cayford, R., Merritt, G. Loop Detector Data Collection and Travel Time Measurement in the Berkeley Highway Laboratory, University of California, 2002.

Coifman, B. and Varaiya, P. Deployment and Evaluation of Real-Time Vehicle Reidentification from an Operations Perspective, University of California, 2002.

Coifman, B. and Varaiya, P. Improving Operations Using Advanced Surveillance Metrics and Existing Traffic Detectors, University of California, 2001.

Coifman, B., and Cassidy, M. Automated Travel Time Measurement Using Vehicle Lengths From Loop Detector Speed Traps, University of California - PATH, 2000.

Cassidy, M., and Coifman, B. Design of a Machine Vision-Based, Vehicle Actuated Traffic Signal Controller, Final Report, University of California - PATH, 1997.

Coifman, B. Time Space Diagrams for Thirteen Shock Waves, University of California - PATH, 1997. [PDF draft]

Coifman, B., and Hansen, M. IVHS Warning-Systems for Light Rail, IEEE Vehicular Technology Society News, vol. 41, no. 4, Nov. 1995, pp 26-33.



IN THE PRESS

Book About Traffic Invites Walking, Columbus Dispatch, August 12, 2008.

Featured interviewee in NY Times best seller: Traffic, Why We Drive the Way We Do, Tom Vanderbilt, Knopf, New York, Toronto, 2008.

Smart traffic boxes could help monitor roads for less money in Ohio, Akron Legal News, July 12, 2007.

Interview, WCMH-TV 4, Columbus, OH, July 7, 2007.

'Smart' Traffic Boxes Could Help Monitor Roads, Save Money, Science Daily, July 5, 2007.

Traffic monitoring gets smart, The Engineer, July 4, 2007.

DIY Public Transportation, Columbus Alive, January 18, 2007

Freeway fixes; I-70/71 split is divisive in other ways, Columbus Dispatch, June 19, 2006.

Ask the Experts: Why do traffic jams sometimes seem to appear out of nowhere? Scientific American on-line: July 19, 2004; print: January 2005.

Spontaneous Congestion, sudden traffic jams leave unlucky drivers scratching their heads, Columbus Dispatch, July 22, 2004.

In-Road Detectors May Improve Traffic Flow, Civil Engineering, ASCE, Vol 73, No 9, September 2003.

New software alleviates traffic, USA Today Magazine, August, 2003.

Traffic spy plane to get test, The Detroit News, June 23, 2003.

Old-fashioned way of keeping track of traffic still counts, Green Bay Press-Gazette, WI, June 9, 2003.

What works in Iraq may also work in highway traffic, The Olympian, WA, June 2, 2003.

Battlefield technology could be used to ease your commute, Coshocton Tribune, OH, June 2, 2003.

Software to Speed Traffic Jam Detection, OSU News in Engineering, Vol 75, No 1, Spring, 2003.

Unmanned planes might help ease traffic congestion,, Columbus Dispatch, May 30, 2003.

Drones to be tested for traffic management tasks, USA Today, May 27, 2003.

Pilotless Planes May Soon Track Traffic, WCMH, WEWS, OH, May 27, 2003.

Drones may fight Ohio traffic jams, Canton Repository, Canton, OH, May 27, 2003.

Drones To Combat Traffic Problems In Ohio, KCRA, KGTV, KTVU, CA; KMGH, CO; WRC-TV, DC; WFTV, WKMG, FL; KITV, HI; WRTV, IN; WCVB, MA; WBAL, MD; WDIV, MI; WAPT, MS; WRAL, NC; WPTZ, NY; WCMH, WEWS, WTOV, OH; WGAL, WPXI, WTAE, PA; WOSC, SC; KIRO, WA; WISC, WI; May 27, 2003.

Drones to be used in traffic control Unmanned aerial vehicles next trend in monitoring roads, WorldNetDaily, May 27, 2003.

Ohio to test pilotless drones to break through traffic, The Chronicle-Telegram, Elyria, OH, May 27, 2003.

Pilotless Planes Could Help Stop Traffic Jams, Ohio News Network, May 26, 2003.

Drones to be tested for traffic management, Beacon Journal, Akron, OH, May 26, 2003.

Drone research looks at traffic applications, Cincinnati Enquirer, May 26, 2003.

Interview, WTTE 28, Columbus, OH, May 20, 2003.

Scientist's software makes road sensors work harder, Columbus Dispatch, May 20, 2003.

Rolling cameras help keep cars rolling, The Lantern, Columbus, OH, April 7, 2003.

OSU professor develops software to help alleviate traffic jams, Daily Reporter, Columbus, OH, March 21, 2003.

Solution to traffic jams, MSN India on-line, March 17, 2003.

Software uses in-road detectors to alleviate traffic jams, Science Letter, March 17, 2003.

Using computers to keep you out of a jam, Cleveland Plain Dealer, March 13, 2003.

Watching the Big Wheelers: In sea of cars, trucks reveal traffic flow, Science News, Vol 163, No 10, March 8, 2003.

Using computers to help commuters, Business Week, March 11, 2003.

Software Uses In-Road Detectors to Alleviate Traffic Jams, Tech News, Vol 5, No 462, February 26, 2003

Using computers to help commuters, C|Net News, February 26, 2003.

Software could solve traffic snarls, San Jose Business Journal, February 25, 2003.

Software uses in-road detectors to alleviate traffic jams, Scientific Computing World, February, 2003.

Software Uses In-road Detectors To Alleviate Traffic Jams, Science Daily, February 26, 2003.

Software Uses In-road Detectors To Alleviate Traffic Jams, Innovations Report, February 26, 2003.

Software Uses In-road Detectors To Alleviate Traffic Jams, Cosmiverse, February 25, 2003.

Type Dreams, TIME Digital Magazine, October 2000.



Ben's Civil Engineering page
Ben's Electrical Engineering page
Traffic Monitoring Laboratory