ROADSIDE INSPECTION DATA AND CRASH DATA ANALYSIS - CAIT

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ACKNOWLEDGEMENTThis project was sponsored by the New Jersey Department of Transportation- Bureau ofTrucking Service (NJDOT- BTS). The authors wish to express appreciation especially toTom Harcar (NJDOT- BTS), Shari D. Leichter (NJDOT- BTS), William Beans (NJDOT-BSP), Jonathan Kasper (NJSP), and Talvin Davis (NJDOT-BTS) for useful insights andexpertise on this project. A grateful acknowledgement should also be made for theirassistants in the development and review of this report which influenced the successfulcompletion of this project.iv
TABLE OF CONTENTSIntroduction ..................................................................................................................... 1Background ................................................................................................................. 1Project Objectives ........................................................................................................ 1Project Accomplishments ............................................................................................ 1Outline of the Report .................................................................................................... 4Appendix One: Crash and Inspection Data Collection Process Analyses ....................... 5Introduction .................................................................................................................. 5Crash Data Collection Process Analysis ...................................................................... 5Overview of the Current Process ............................................................................. 5Evaluation of Current Crash Data Collection Process ............................................ 10Crash Data Collection Process Issues ................................................................... 12Recommendations ................................................................................................. 14Inspection Data Collection Process Analysis ............................................................. 17Overview of Current Process ................................................................................. 17Evaluation of Inspection Process ........................................................................... 21Recommendations ................................................................................................. 23Methodology for State Safety Data Quality ................................................................ 25Methodology Review .............................................................................................. 25NJ State Ratings and SSDQ Measures Evaluation ................................................ 32Summary of Issues ................................................................................................ 43Appendix two: Commercial Motor Vehicle Crash Analyses .......................................... 45Introduction ................................................................................................................ 45Frequency Analysis ................................................................................................... 46Comparing CMV and truck crashes ....................................................................... 46Trend Analysis ........................................................................................................... 47GIS Analysis .............................................................................................................. 47Cross Tabulation (Cross tab) Analysis ....................................................................... 48Crash Rate Analysis .................................................................................................. 50Critical Crash Rate Analysis ...................................................................................... 51Severity Rate Analysis ............................................................................................... 52v
Page 1 and 2: clearing the air:How the San Joaqui
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Page 7 and 8: LIST OF FIGURESFigure 1. Crash Data
Page 9 and 10: Table 24. Calculated crash rate in
Page 11 and 12: LIST OF CHARTSChart 1. Crash freque
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ROADSIDE INSPECTION DATA AND CRASH DATA ANALYSIS - CAIT

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