Recent publications in Transportation

• Tools for Operations Planning (TOPL).
  Website for the TOPL project.
• Performance Measurement System (PeMS).
  Website for California Freeway Performance Measurement System.
• Roadway Detection System -- Research and Development Site.
  Website for current PATH-sponsored project on traffic measurement.

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• Constructing transportation system intelligence using PeMS.
  P. Varaiya, August 2002. PowerPoint presentation, Plenary Talk, 2002 IEEE ITSC Conference, Singapore, September 2002. [pdf, 1006K]

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• Probe vehicle runs or loop detectors? Effect of detector spacing and sample size on accuracy of freeway congestion monitoring
  J. Kwon, K. Petty and P. Varaiya. Transportation Research Record, No. 2012: 57--63.
• Wireless magnetic sensors for traffic surveillance
  A. Haoui, R. Kavaler and P. Varaiya. Transportation Research C, in press, 2008.
• An analysis of the I-680S HOT lane project
  P. Varaiya. October 2007. [pdf]
• Freeway congestion, ramp metering, and tolls
  P. Varaiya. Philosophical Trans. Royal Society A, 366: 1921-1930, 2008. [pdf, 690KB]
• Behavior of the Cell Transmission Model and Effectiveness of Ramp Metering
  G. Gomes, R. Horowitz, A. Kurzhanskiy, P. Varaiya and J. Kwon. Transportation Research C, in press, 2008. [pdf, 2177KB]
• Effectiveness of California's High Occupancy Vehicle (HOV) System
  J. Kwon and P. Varaiya. Transportation Research C, in press, 2008. [pdf, 467KB]
• Effectiveness of California's High Occupancy Vehicle (HOV) System
  J. Kwon and P. Varaiya. July 2006. [pdf, 437KB]
• Components of Congestion: Delay from Incidents, Special Events, Lane Closures, Weather, Potential Ramp Metering Gain, and Excess Demand
  J. Kwon, M. Mauch and P. Varaiya TRB 85th Annual Meeting, January 2006. [pdf, 171K]
• Effectiveness of high occupancy vehicle (HOV) lanes in the San Francisco Bay Area
  J. Kwon and P. Varaiya. July 2005. [pdf, 168KB]
• What we have learned about highway congestion.
  P. Varaiya, April 2005. Access, Fall 2005. [pdf, 2.2MB]
• An empirical assessment of traffic operations.
  C. Chao, J. Kwon and P. Varaiya, January 2005. International Symposium on Transportation and Traffic Theory. July 2005. [pdf, 2.44M]
• The empirical assessment of traffic operations.
  C. Chao, J. Kwon and P. Varaiya, January 2005. Expanded versionn of preceding paper. [pdf, 3.7M]
• Traffic Measurement and Vehicle Classification with a Single Magnetic Sensor.
  S.Y. Cheung, S. Coleri, B. Dundar, S. Ganesh, C-W. Tan and P. Varaiya, November 2004. TRB 84th Annual Meeting, January 2005. Also Transportation Research Record, 1917, 173-181. [pdf, 149K]
• Real-time estimation of O-D matrices with partial trajectories from ETC taq data.
  J. Kwon and P. Varaiya, July 2004. TRB 84th Annual Meeting, January 2005. Transportation Research Record, 1923, 119-126. [pdf, 123K]
• The congestion pie: delay from collisions, ramp metering gain, and excess demand.
  J. Kwon and P. Varaiya, November 2004. TRB 84th Annual Meeting, January 2005 [pdf, 1.95M]
• Acquisition and utilization of real-time district-wide truck traffic volume data from single loop detectors.
  J. Kwon et al, June 2003. [pdf, 480K]
• A system for displaying travel times on changeable message signs.
  C. Chao et al, July 2003. TRB 83rd Annual Meeting. January 2004 [pdf, 149K]
• Systematic identification of freeway bottlenecks.
  C. Chao et al, July 2003. TRB 83rd Annual Meeting. January 2004. Also Transportation Research Record 1867, 46-52. [pdf, 161K]
• Freeway Data Collection, Storage, Processing, and Use.
  P. Varaiya, August 2002. TRB Workshop:The Roadway INFOstructure August 21-23, 2002 Irvine, CA. [pdf, 750K]
• Estimation of truck traffic volume from single loop detector using lane-to-lane speed correlation.
  J. Kwon et al, August 2002. TRB 82nd Annual Meeting, January 2003, Transportation Research Record no. 1856, 106-117. [pdf, 384K]
• Measuring recurrent and non-recurrent traffic congestion.
  A. Skabardonis et al, August 2002. TRB 82nd Annual Meeting, January 2003 [pdf, 391K]
• Detecting and imputing single loop errors.
  C. Chen et al, August 2002.TRB 82nd Annual Meeting, January 2003, Transportation Research Record no. 1855, 160-167. [pdf, 696K]
• Travel time reliability as a measure of service.
  C. Chen et al, August 2002. TRB 82nd Annual Meeting, January 2003 [pdf, 306K]
• Freeway performance measurment system: mining loop detector data.
  C. Chen, K. Petty, A. Skabardonis and P. Varaiya. TRB 80th Annual Meeting, January 2001. Also Transportation Research Record 1748, 96-102, 2001. [pdf 212K]
• The Freeway-Congestion Pardox
  C. Chen and P. Varaiya, November 2001. Access 20, Spring 2002. [pdf, 172K]
• California's performance measurement system: Improving freeway efficiency through transportation intelligence.
  P. Varaiya, July 2001, appears in TR News, 218, Jan-Feb 2002. [pdf, 262K]
• Maximum flow in D12 occurs at 60 mph.
  C. Chen et al, December 2001. [pdf, 91K]
• Freeway performance measurement system (PeMS): An operational analysis tool.
  T. Choe et al. TRB 81st Annual Meeting, January 2002.[pdf, 520K]
• Causes and cures of highway congestion.
  C. Chen, Z. Jia and P. Varaiya, August 2001. IEEE Control Systems Magazine, 21(4), 26--33, Dec 2001. [pdf, 196K]
• The PeMS algorithms for accurate, real-time estimates of g-factors and speeds from single-loop detectors.
  Z. Jia et al. 4th IEEE ITSC Conference, August 2001. [pdf, 223K]
• Space division multiple access (SDMA) for robust ad hoc vehicle communication networks.
  S.V. Bana et al. 4th IEEE ITSC Conference, August 2001. [pdf, 223K]
• Real-time vehicle location with desired accuracy.
  S.V. Bana et al. 4th IEEE ITSC Conference, August 2001. [pdf, 169K]
• Maximum throughput in California freeways occurs at 60 mph.
  Zhanfeng Jia et al, December 2000. [pdf, 68K]
• Optimal metering strategy.
  C. Chen and P. Varaiya, November 2000.
• Congestion, effective capacity, and excess demand in California freeways.
  Zhanfeng Jia et al, October 2000 (revised December 2000). [pdf, 331K]
• Freeway performance measurement system: mining loop detector data.
  Chao Chen et al, July 2000. TRB 80th Annual Meeting, January 2001.[pdf, 319K]
• Intelligent Transportation Systems Research Products for Public Works Professionals
  P. Conroy, S. Shladover, J. Dahlgren, W. Recker, S. Ritchie and P. Varaiya.
• How to measure transportation system performance.
  Pravin Varaiya, Nov. 1997. [pdf, 4730K]
• The Freeway Service Project.
  K.Petty et al. Transportation Research Part C, 4(3), 1996. [pdf, 348K]
• Automated highway systems: a technology for the 21st century.
  Pravin Varaiya, October 1997. [pdf, 699K]
• Evaluation Tools for Automated Highway Systems.
  A. Deshpande and P. Varaiya. Second European Workshop on Hybrid Systems, Institut National Polytechnique de Grenoble. 1995. [postscript, 230K]
• A theory of traffic flow in automated highway systems,
  M. Broucke and P. Varaiya, August 1995. [pdf, 307K]
• Entry/exit implementation.
  Final Report of AHS Precursor Systems Analysis. December 1994. [postscript, 1.8M]
• Flow benefits of autonomous intelligent cruise control in mixed manual and automated traffic.
  Bobby Rao and Pravin Varaiya, Transportation Research Record, No. 1408, 1993, 35-43.