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CVEN 689 – SPRING 2005 LEI XU May 2th, 2005

hide. hide. A GIS-BASED STUDY OF HOW THE HOT LANE IMPLEMENTATION IMPACTS SAFETY ON HOUSTON KATY FREEWAY HOV LANE CORRIDOR. CVEN 689 – SPRING 2005 LEI XU May 2th, 2005. CONTENTS OF PRESENTATION. Background Problem Statement Data Preparation Geodatabase Development Results of Analysis

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CVEN 689 – SPRING 2005 LEI XU May 2th, 2005

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  1. hide hide A GIS-BASED STUDY OF HOW THE HOT LANE IMPLEMENTATION IMPACTS SAFETY ON HOUSTON KATY FREEWAY HOV LANE CORRIDOR CVEN 689 – SPRING 2005 LEI XU May 2th, 2005

  2. CONTENTS OF PRESENTATION • Background • Problem Statement • Data Preparation • Geodatabase Development • Results of Analysis • Recommended future work

  3. BACKGROUND • Levels of traffic congestion have been increasing, causing increased environmental and energy concerns • HOV Lane – A demand management strategy for congestion control • HOT Lane – An alternative to HOV lane with a pricing strategy

  4. BACKGROUND (CONT’D) • The successful operation of HOV lanes has already existed in Houston for a history of 26 years.

  5. HOUSTON QUICKRIDE PROGRAM

  6. PROBLEM STATEMENT • Some researchers and government agencies are now trying to justify the conversion from HOV lane to HOT lane in some urban areas • Benefits and prudence of HOT lane conversion have become an important issue • This study is going to identify how the HOT lane implementation impacts the highway safety

  7. DATA PREPARATION • Harris County study area map shape file • Texas General Land Office website • Accident data (1996-2000) • TxDOT TRF accident file • Harris County major roadway network shape file (fractions of the roadway based on the Harris County control-section map) • Department of Geography, TAMU • Harris County control-section map • TxDOT

  8. ACCIDENT DATA TABLE

  9. Harris County CONTROL-SECTION MAP

  10. GEODATABASE DEVELOPMENT • Coordinate system • NAD_1983_Texas_Statewide_Mapping_System • Dynamic segmentation • Polyline → Route • Accident location identification • Add route events (accident observation)

  11. DYNAMIC SEGMENTATION Route Editing Tool

  12. MAJOR ROAD NETWORK BEFORE DYNAMIC SEGMENTATION

  13. MAJOR ROAD NETWORK AFTER DYNAMIC SEGMENTATION

  14. HARRIS COUNTY HOV LANES

  15. ACCIDENT LOCATION IDENTIFICATION

  16. CRASH ALLOCATION MAP

  17. RESULTS OF ANALYSIS

  18. RESULTS OF ANALYSIS (CONT’D)

  19. RESULTS OF ANALYSIS (CONT’D)

  20. RESULTS OF ANALYSIS (CONT’D)

  21. RESULTS OF ANALYSIS (CONT’D) • There was a significant decreasing trend of the crash rate on the Katy HOT lane corridor based on the current results from 1998 to 2000 • The crash rates on other HOV corridors were not significantly decreasing • This difference could be partially due to the implementation of HOT lane on the Katy Freeway

  22. RECOMMENDED FURTHER WORK • To expand the sample size of the data • Data up to 2004 would be helpful to analyze the US-290 HOT lane implementation • To compare the crash rate based on the traffic volume • It would bring a more reasonable comparison to integrate vehicle mile traveled (VMT) into the crash rate as a denominator

  23. END OF PRESENTATION ANY QUESTIONS?

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