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TitleReport NumberAuthor(s)Date
Synthesis Study of Texas Signal Control Systems: Technical Report0-6670-1D. Sun, L. Dodoo, H.K. Penumala, A. Rubio, H. Zhou, M.P. Pratt, S.R. SunkariDecember 2012
Dealing with Texas-Sized Problems Around Schools: Workshop Materials5-5470-01-P1S.A. Cooner, M.A. Brewer, K. FitzpatrickMarch 2012
Development of Guidelines for Pedestrian Safety Treatments at Signalized Intersections0-6402-1J.A. Bonneson, M.P. Pratt, P. SongchitruksaJanuary 2012
School Traffic Workshop: Dealing with Texas-Sized Problems around Schools5-5470-01-1S.A. Cooner, M.A. Brewer, K.M. FitzpatrickJanuary 2012
Synthesis of TxDOT Uses of Real-Time Commercial Traffic Data0-6659-1D.R. Middleton, R. Rajbhandari, R.E. Brydia, P. Songchitruksa, E. Kraus, S. Hernandez, K. Cheu, V. Iragavarapu, S.M. TurnerJanuary 2012
TxDOT Uses of Real-Time Commercial Traffic Data: Opportunity Matrix0-6659-P1D.R. Middleton, R. Rajbhandari, R.E. Brydia, P. Songchitruksa, E. Kraus, S. Hernandez, K. Cheu, V. Iragavarapu, S.M. TurnerJanuary 2012
Analysis of Roadway Departure Crashes on Two-Lane Rural Roads in Texas0-6031-1D. Lord, M.A. Brewer, K. Fitzpatrick, S.R. Geedipally, Y. PengDecember 2011
Modern Traffic Control Devices to Improve Safety at Rural Intersections0-6462-1K. Fitzpatrick, S.T. Chrysler, S.R. Sunkari, J.M. Cooper, B. Park, L.L. HigginsDecember 2011
Traffic Signal Operations Handbook: Workshop Training (IPR011)5-5629-01-P1J.A. Bonneson, M.P. PrattNovember 2011
Traffic Signal Operations Handbook: Workshop Training. Instructor Guide5-5629-01-P2J.A. Bonneson, M.P. PrattNovember 2011
Traffic Signal Operations Handbook, Second Edition0-6402-P1J.A. Bonneson, S.R. Sunkari, M.P. Pratt, P. SongchitruksaOctober 2011
Pedestrian Safety Treatments for Signalized Intersections0-6402-P3J.A. Bonneson, M.P. Pratt, P. SongchitruksaOctober 2011
Traffic Signal Operations Handbook Workshop Series: Final Report5-5629-01-1M.P. Pratt, J.A. BonnesonOctober 2011
Operations and Safety of Super 2 Corridors with Higher Volumes0-6135-1M.A. Brewer, S.P. Venglar, L. Ding, K. Fitzpatrick, B. ParkJune 2011
Work Zone Positive Protection Guidelines0-6163-1G.L. Ullman, V. Iragavarapu, D. SunMay 2011
Safety and Economic Impacts of Converting Two-Way Frontage Roads to One-Way: Methodology and Findings0-5856-1W.L. Eisele, C.E. Yager, M.A. Brewer, W.E. Frawley, E. Park, D. Lord, J.A. Robertson, P. KuoJanuary 2011
Super 2 Design for Higher Traffic Volumes0-6135-SM.A. Brewer, S.P. Venglar, L. Ding, K. Fitzpatrick, B. Park 2011
Development of Pedestrian Safety Based Warrants for Protected or Protected-Permissive Left Turn (PPLT) Control0-6402-SJ.A. Bonneson, M.P. Pratt, P. Songchitruksa, K. Fitzpatrick 2011
Revised Text for TxDOT Manual: Roadway Design Manual5-4703-01-P7J.A. Bonneson, M.P. PrattDecember 2010
Highway Safety Design Workshops5-4703-01-1J.A. Bonneson, M.P. PrattNovember 2010
Guidelines for Spacing Between Freeway Ramps0-5860-1K. Fitzpatrick, R.J. Porter, G. Pesti, C. Chu, E. Park, T.Q. LeMarch 2010
Development of Safety Performance Monitoring Procedures0-4703-7M.P. Pratt, J.A. BonnesonFebruary 2010
Driver Workload at Higher Speeds0-5911-1K. Fitzpatrick, S.T. Chrysler, E. Park, A.A. Nelson, J.A. Robertson, V. IragavarapuFebruary 2010
Driver Workload and Visual Studies0-5911-SK. Fitzpatrick, S.T. Chrysler, E. Park, A.A. Nelson, J.A. Robertson, V. IragavarapuFebruary 2010
Revised Text for TxDOT Manual Procedures for Establishing Speed Zones, Chapter 5, Section 25-5439-01-P2J.A. Bonneson, M.P. PrattFebruary 2010
Guidelines for Ramp Terminal Spacing for Freeways0-5860-SK. Fitzpatrick, R.J. Porter, G. Pesti, C. Chu, E. Park, T.Q. LeDecember 2009
Workshops on Using the GPS Method to Determine Curve Advisory Speeds5-5439-01-1M.P. Pratt, J.D. Miles, J.A. BonnesonDecember 2009
Incorporating Safety into the Highway Design Process: Summary Report0-4703-SJ.A. Bonneson, K. Fitzpatrick, D. Lord, K.H. ZimmermanOctober 2009
Guidance on Mitigating Impacts of Large Distribution Centers on Texas Highways0-5335-SB.S. Bochner, L.L. Higgins, W.E. Frawley, R. Cheu, K. Fitzpatrick, E.N. Hard, R.R. Longmire, D.R. Middleton, C. Morgan, A.J. WimsattOctober 2009
Studies to Determine the Operational Effects of Shoulder and Centerline Rumble Strips on Two-Lane Undivided Roadways0-5577-1M.D. Finley, D.S. Funkhouser, M.A. BrewerAugust 2009
Development of a Traffic Signal Operations Handbook0-5629-1J.A. Bonneson, M.P. Pratt, K.H. ZimmermanAugust 2009
Roadway Safety Design Workbook0-4703-P2J.A. Bonneson, M.P. PrattJuly 2009
Traffic Signal Operations Handbook0-5629-P1J.A. Bonneson, S.R. Sunkari, M.P. PrattMarch 2009
Speeds in School Zones0-5470-1K. Fitzpatrick, M.A. Brewer, K.O. Obeng-Boampong, E. Park, N.D. TroutFebruary 2009
Speeds in School Zones: Appendix A0-5470-1-Appendix AK. Fitzpatrick, M.A. Brewer, K.O. Obeng-Boampong, E. Park, N.D. TroutFebruary 2009
Incorporating Safety into the Highway Design Process: Fifth-Year Report0-4703-6J.A. Bonneson, M.P. Pratt 2009
60-Minute Hands-on Training Module0-5470-P1K. Fitzpatrick 2009
Pedestrian Accessibility at Signalized Intersections0-4701-P4M.A. Brewer, H.G. Hawkins, Jr. 2009
Calibration Factors Handbook: Safety Prediction Models Calibrated with Texas Highway System Data0-4703-5J.A. Bonneson, M.P. PrattOctober 2008
Comprehensive Guide to Traffic Control Near Schools0-5470-SK. Fitzpatrick, M.A. Brewer, K.O. Obeng-Boampong, E. Park, N.D. TroutAugust 2008
Best TxDOT Practices for Signal Timing and Detection Design at Intersections0-5629-SJ.A. Bonneson, M.P. Pratt, S. SunkariAugust 2008
Compendium of Student Papers: 2008 Undergraduate Transportation Scholars ProgramSWUTC/08/476660-00003-1R.A. Ayala, T.J. Hunter, L.K. Larsen, M.P. Mulkern, J.A. Robertson, H.G. Hawkins, Jr.August 2008
Driver Comprehension of Signing and Markings for Toll Facilities0-5446-2S.T. Chrysler, A.A. Williams, K. FitzpatrickFebruary 2008
Investigating Pedestrian Components in Temporary Traffic Control0-5237-1B.R. Ullman, M.A. Brewer, K. Fitzpatrick, G.L. UllmanJanuary 2008
Development of Guidelines for Handling Pedestrians in Temporary Traffic Control Areas0-5237-SB.R. Ullman, M.A. Brewer, K. Fitzpatrick, G.L. UllmanOctober 2007
Development of Guidelines for Establishing Effective Curve Advisory Speeds0-5439-1J.A. Bonneson, M.P. Pratt, J.D. Miles, P.J. CarlsonOctober 2007
Horizontal Curve Signing Handbook0-5439-P1J.A. Bonneson, M.P. Pratt, J.D. Miles, P.J. CarlsonOctober 2007
Identifying and Testing Effective Advisory Speed Setting Procedures0-5439-SJ.A. Bonneson, M.P. Pratt, J.D. Miles, P.J. CarlsonAugust 2007
Preliminary Guidelines for Signing on Toll Facilities0-5446-1S.T. Chrysler, A.A. Williams, K. FitzpatrickMarch 2007
Intermediate Access to Buffer-Separated Managed Lanes0-5547-1K. Fitzpatrick, M.A. Brewer, E. ParkMarch 2007
Criteria for High Design Speed Facilities0-5544-1K. Fitzpatrick, K.H. Zimmerman, R.P. Bligh, S.T. Chrysler, B.C. BlaschkeMarch 2007
Development of Tools for Evaluating the Safety Implications of Highway Design Decisions0-4703-4J.A. Bonneson, D. Lord, K.H. Zimmerman, K. Fitzpatrick, M.P. PrattFebruary 2007
Evaluation of Wet-Weather and Contrast Pavement Marking Applications0-5008-SP.J. Carlson, J.D. Miles, A.M. Pike, E. Park, M.P. PrattFebruary 2007
Driver Comprehension of Diagrammatic Freeway Guide Signs0-5147-1S.T. Chrysler, A.A. Williams, D.S. Funkhouser, A.J. Holick, M.A. BrewerFebruary 2007
Checklist for Accommodating Pedestrians in Temporary Traffic Control Areas0-5237-P1K. Fitzpatrick, M.A. Brewer, B.R. Ullman, G.L. Ullman 2007
Red-Light-Running Handbook Workshop Series: Year 2 Summary Report5-4196-01-2J.A. Bonneson, K.H. Zimmerman, M.P. PrattOctober 2006
Best Practices for Access Between Toll Lanes and Free Lanes0-5547-SK. Fitzpatrick, M.A. Brewer, E. ParkOctober 2006
Development of High Speed Roadway Design Criteria and Evaluation of Roadside Safety Features0-5544-SK. Fitzpatrick, K.H. Zimmerman, R.P. Bligh, S.T. Chrysler, B.C. BlaschkeOctober 2006
Guidelines for the Use of Diagrammatic Guide Signs and Their Alternatives0-5147-SS.T. Chrysler, A.A. Williams, D.S. Funkhouser, A.J. Holick, M.A. BrewerAugust 2006
Interim Roadway Safety Design Workbook0-4703-P4J.A. Bonneson, K.H. Zimmerman, Kay FitzpatrickApril 2006
Summary of Comparison of Crashes on Rural Two-Lane and Four-Lane Highways in Texas0-4618-SK. Fitzpatrick, W.H. Schneider, E. ParkFebruary 2006
Summary of Treatments to Improve Work Zone Speed Limit Compliance0-4707-SM.A. Brewer, G. Pesti, W.H. SchneiderDecember 2005
Roadway Safety Design Synthesis0-4703-P1J.A. Bonneson, K.H. Zimmerman, K. FitzpatrickNovember 2005
Managed Lanes Handbook0-4160-24B.T. Kuhn, V.D. Goodin, A.J. Ballard, M.A. Brewer, R.E. Brydia, J.L. Carson, S.T. Chrysler, T.S. Collier, K. Fitzpatrick, D.L. Jasek, C.M. Dusza, G.L. UllmanOctober 2005
Identification and Testing of Measures to Improve Work Zone Speed Limit Compliance0-4707-1M.A. Brewer, G. Pesti, W.H. SchneiderOctober 2005
Findings from Texas: Five Years of Research on Managed Lanes0-4160-25B.T. Kuhn, V.D. Goodin, A.J. Ballard, M.A. Brewer, R.E. Brydia, J.L. Carson, S.T. Chrysler, T.S. Collier, W.L. Eisele, D.W. Fenno, K. Fitzpatrick, G.L. Ullman, S.P. VenglarSeptember 2005
Comparisons of Crashes on Rural Two-Lane and Four-Lane Highways in Texas0-4618-1K. Fitzpatrick, W.H. Schneider, E. ParkSeptember 2005
Red-Light Running Handbook Workshop Series: Year 1 Summary Report5-4196-01-1J.A. Bonneson, K.H. Zimmerman, M.P. PrattSeptember 2005
Evaluation of Wet-Weather Pavement Markings: First Year Report0-5008-1P.J. Carlson, J.D. Miles, M.P. Pratt, A.M. PikeSeptember 2005
Summary of Treatments for Crashes on Rural Two-Lane Highways in Texas0-4048-SK. Fitzpatrick, M.A. BrewerAugust 2005
Texas Urban Intersection Design Guide Now Available0-4365-SK. Fitzpatrick, M.D. Wooldridge, J.D. BlaschkeApril 2005
Handbook Details Crash Treatments for Rural Highways0-4048-4K. Fitzpatrick, A.H. Parham, M.A. BrewerApril 2005
Traffic Operational Impacts of Transverse, Centerline, and Edgeline Rumble Strips0-4472-2J.D. Miles, P.J. Carlson, M.P. Pratt, T.D. ThompsonMarch 2005
Urban Intersection Design Guide: Volume 1- Guidelines0-4365-P2 (V1)K. Fitzpatrick, M.D. Wooldridge, J.D. BlaschkeFebruary 2005
Urban Intersection Design Guide: Volume 2 - Applications0-4365-P2 (V2)K. Fitzpatrick, M.D. Wooldridge, J.D. BlaschkeFebruary 2005
A Plan for Incorporating Safety into the Highway Design Process0-4703-1J.A. Bonneson, K. Fitzpatrick, M.D. Wooldridge, D. LordJanuary 2005
Preliminary Evaluations of Safety Treatments on Rural Highways in Texas0-4048-5M.A. Brewer, K. FitzpatrickOctober 2004
Year 4 Annual Report of Progress: Operating Freeways with Managed Lanes0-4160-19B.T. Kuhn, V.D. Goodin, A.J. Ballard, R.E. Brydia, S.T. Chrysler, T.S. Collier, A.S. Cothron, W.L. Eisele, D.W. Fenno, K.M. Fitzpatrick, S.Y. Song, G.L. Ullman, S.P. VenglarSeptember 2004
Turn Speeds and Crashes within Right-Turn Lanes0-4365-4K. Fitzpatrick, W.H. SchneiderSeptember 2004
Left-Turn and Rumble Strip Treatments for Rural Intersections: Project Summary Report0-4278-SK. Fitzpatrick, M.A. Brewer, A.H. ParhamJuly 2004
Summary of Guidelines for Roadway Facilities Around Schools0-4286-SS.A. Cooner, K. Fitzpatrick, M.D. Wooldridge, G.L. FordJune 2004
Traffic Operations and Safety at Schools: Recommended Guidelines0-4286-2S.A. Cooner, K. Fitzpatrick, M.D. Wooldridge, G.L. FordJanuary 2004
Operations and Safety Around Schools: Overview of Project Activities and Findings0-4286-3S.A. Cooner, K. Fitzpatrick, M.D. Wooldridge, J.A. Crawford, G.L. FordJanuary 2004
Guidelines to Reduce Red-Light-Running0-4027-SJ.A. Bonneson, K.H. Zimmerman, M.A. BrewerOctober 2003
Interim Manual for Managed Lanes0-4160-14B.T. Kuhn, V.D. Goodin, M.A. Brewer, T.S. Collier, K. Fitzpatrick, D.L. Jasek, S.P. VenglarOctober 2003
Year 3 Annual Report of Progress: Operating Freeways with Managed Lanes0-4160-15B.T. Kuhn, V.D. Goodin, S.T. Chrysler, T.S. Collier, A.S. Cothron, W.L. Eisele, D.W. Fenno, K. Fitzpatrick, G.L. Ullman, S.P. VenglarSeptember 2003
Left-Turn and In-Lane Rumble Strip Treatments for Rural Intersections0-4278-2K. Fitzpatrick, M.A. Brewer, A.H. ParhamSeptember 2003
Managed Lane Ramp and Roadway Design Issues0-4160-10K.M. Fitzpatrick, M.A. Brewer, S.P. VenglarJanuary 2003
Traffic Operations and Safety At Schools: Review of Existing Guidelines0-4286-1S.A. Cooner, K.M. Fitzpatrick, M.D. Wooldridge, J.A. Crawford, G.L. FordOctober 2002
Additional Characteristics of Crashes on Rural Two-Lane Highways0-4048-3K.M. Fitzpatrick, M.A. BrewerSeptember 2002
Year 2 Annual Report of Progress: Operating Freeways with Managed Lanes0-4160-12B.T. Kuhn, V.D. Goodin, T.S. Collier, A.S. Cothron, W.L. Eisele, K. Fitzpatrick, S.P. VenglarSeptember 2002
Issues to Consider in Developing an Intersection Design Guide0-4365-1K.M. Fitzpatrick, A.H. Parham, M.D. WooldridgeSeptember 2002
Summary of Issues in Intersection Design0-4365-2K.M. Fitzpatrick, A.H. Parham, M.D. WooldridgeSeptember 2002
Engineering Countermeasures to Reduce Red-Light-Running0-4027-2J.A. Bonneson, K.H. Zimmerman, M.A. BrewerAugust 2002
Treatments for Crashes on Rural Two-Lane Highways in Texas0-4048-2K.M. Fitzpatrick, A.H. Parham, M.A. BrewerApril 2002
Super 2 Highways: Two-Lane Rural Highways with Passing Lanes0-4064-SM.D. Wooldridge, C.J. Messer, D.S. Heard, S. Raghupathy, A.H. Parham, M.A. Brewer, S. LeeFebruary 2002
Characteristics of and Potential Treatments for Crashes on Low-Volume, Rural Two-Lane Highways in Texas0-4048-1K.M. Fitzpatrick, A.H. Parham, M.A. Brewer, S. MiaouOctober 2001
Review and Evaluation of Factors that Affect the Frequency of Red-Light-Running0-4027-1J.A. Bonneson, M.A. Brewer, K.H. ZimmermanSeptember 2001
Design Guidelines for Passing Lanes on Two-Lane Roadways (Super 2)0-4064-1M.D. Wooldridge, C.J. Messer, D.S. Heard, S. Raghupathy, A.H. Parham, M.A. Brewer, S. LeeSeptember 2001
Issues Related to Design of At-Grade Intersections Near Highway-Railroad Grade Crossings0-1845-SM.D. Wooldridge, D.B. Fambro, M.A. Brewer, R.J. Engelbrecht, S.R. Harry, H. ChoAugust 2001
At-Grade Intersections Near Highway-Railroad Grade Crossings0-1845-2M.D. Wooldridge, D.B. Fambro, M.A. Brewer, R.J. Engelbrecht, S.R. Harry, H. ChoAugust 2001
Design Factors that Affect Driver Speed on Suburban Arterials1769-SK.M. Fitzpatrick, P.J. Carlson, M.D. Wooldridge, M.A. BrewerNovember 2000
Design Guidelines for At-Grade Intersections Near Highway-Railroad Grade Crossings0-1845-3M.D. Wooldridge, D.B. Fambro, M.A. Brewer, R.J. Engelbrecht, S.R. Harry, H. ChoNovember 2000
Design Guidelines to Accommodate Incident Management0-1848-SA.H. Parham, M.D. Wooldridge, D.W. Fenno, K.M. Fitzpatrick, D.L. Jasek, S.E. RanftAugust 2000
Design Factors That Affect Driver Speed on Suburban Arterials1769-3K.M. Fitzpatrick, P.J. Carlson, M.D. Wooldridge, M.A. BrewerJune 2000
Facilitating Incident Management Strategies on Freeways0-1848-1A.H. Parham, M.D. Wooldridge, D.W. Fenno, K.M. Fitzpatrick, D.L. Jasek, S.E. RanftNovember 1999
Predicting Speed on Tangents Using Alinement IndicesTRB 990124K.D. Parma, K.M. Fitzpatrick, R.A. Krammes 1999
Speed Variability on Rural Two-Lane HighwaysTRB 990457J.M. Collins, K.M. Fitzpatrick, K.M. Bauer, D.W. Harwood 1999
Logistic Models of Violation Behavior at Gated Highway Rail Grade CrossingsTRB 990259K.M. Fitzpatrick, P.J. Carlson 1999
Evaluation and Modification of Sight Distance Criteria Used by TxDOT0-1811-1M.D. Wooldridge, A.H. Parham, K.M. Fitzpatrick, R.L. Nowlin, R.E. BrydiaSeptember 1998
Evaluation and Modification of Sight Distance Criteria Used by TxDOT0-1811-SM.D. Wooldridge, A.H. Parham, R.L. Nowlin, K.M. Fitzpatrick, R.E. BrydiaSeptember 1998
Investigating Speed Management Techniques0-1770-SA.H. Parham, K.M. FitzpatrickSeptember 1998
Handbook of Speed Management Techniques0-1770-2A.H. Parham, K.M. FitzpatrickSeptember 1998
Implementation Action Items for Research Study Number 7-2987TTI-1997-1K.M. Fitzpatrick, P.J. Carlson, R.E. Bartoskewitz, J.A. BeanOctober 1997
Traffic Violations at Gated Highway-Railroad Grade Crossings7-2987-1K.M. Fitzpatrick, P.J. Carlson, J.A. Bean, R.E. BartoskewitzOctober 1997
Demonstration of Automated Enforcement Systems at Selected Highway-Railroad Grade Crossings in Texas7-2987-2FK.M. Fitzpatrick, R.E. Bartoskewitz, P.J. CarlsonOctober 1997
Procedures to Determine Frontage Road Level of Service and Ramp Spacing1393-4FK.M. Fitzpatrick, R.L. Nowlin, A.H. ParhamAugust 1996
Development of Level-of-Service Analysis Procedure for Frontage Roads1393-3K.M. Fitzpatrick, R.L. Nowlin, A.H. ParhamAugust 1996
Two-Sided Weaving Analysis on One-Way Frontage Roads1393-2R.L. Nowlin, K.M. FitzpatrickJune 1996
Speed: Understanding Design, Operating, and Posted Speed1465-1R.A. Krammes, K.M. Fitzpatrick, J.D. Blaschke, D.B. FambroMarch 1996
One-Sided Weaving Operations on One-Way Frontage RoadsTRB 960619K.M. Fitzpatrick, R.L. Nowlin 1996
Design Speed, Operating Speed, and Posted Speed SurveyTRB 960620K.M. Fitzpatrick, C.B. Shamburger, D.B. Fambro 1996
One-Sided Weaving Analysis on One-Way Frontage Roads1393-1K.M. Fitzpatrick, R.L. NowlinNovember 1995
Compatibility of Design Speed, Operating Speed, and Posted Speed1465-2FK.M. Fitzpatrick, J.D. Blaschke, C.B. Shamburger, R.A. Krammes, D.B. FambroOctober 1995
Improved Communication of a Left Exit Lane Drop Using Pavement Markings1232-27K.M. Fitzpatrick, M.T. Lance, T. UrbanikSeptember 1994
Intercity Bus Industry in Texas1337-1FK.M. Fitzpatrick, K. Kuenzer, T.K. Lienau, T. UrbanikNovember 1993
Freeway Exit Lane Drops in Texas1292-1FK.M. Fitzpatrick, T.K. Lienau, M.A. Ogden, M.T. Lance, T. UrbanikNovember 1993
Factors Affecting Traffic Operations on Seven-Lane Cross Sections1293-2FK.N. Balke, K.M. Fitzpatrick, T.K. LienauNovember 1993
Evaluation of Flush Medians and Two-Way, Left-Turn Lanes on Four-Lane Rural Highways1293-1K.N. Balke, K.M. FitzpatrickNovember 1993
A Historical and Literature Review of Horizontal Curve Design1949-1K.M. Fitzpatrick, K. KahlSeptember 1992
Review of Automated Enforcement1232-5K.M. FitzpatrickNovember 1991
Considerations in Developing a Strategic Arterial Street System1107-5FT. Urbanik, W.V. Ward, K.M. Fitzpatrick, J.A. Mullins, T.J. KrugerNovember 1990
Mobility Impacts from Improvements to an Arterial Street1107-3K.M. Fitzpatrick, B.C. Rymer, T. UrbanikSeptember 1990
Guidelines for Planning, Designing and Operating Bus-Related Street Improvements1225-2FK.M. Fitzpatrick, T. Urbanik, R.W. StokesAugust 1990
Automated Enforcement -- Legal Issues: Technical MemorandumK.M. Fitzpatrick, T. UrbanikAugust 1990
Automated Enforcement: Technical MemorandumTTI-1990-10K.M. FitzpatrickApril 1990