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Publication Number: FHWA-RD-98-133
Date: October 1998

Accident Models for Two-Lane Rural Roads: Segment and Intersections

LIST OF TABLES

1. Variables collected in the study

2. Summary Statistics: 619 Segments, Minnesota State

3. Summary Statistics: 712 Segments, Washington State

4. Summary Statistics: 389 Three-Legged Intersections, Minnesota State

5. Summary Statistics: 181 Three-Legged Intersections, Washington State

6. Summary Statistics: 327 Four-Legged Intersections, Minnesota State

7. Summary Statistics: 90 Four-Legged Intersections, Washington State

8. Bivariate Statistics: Segment Accidents versus Other Variables

9. Bivariate Statistics: 3-Legged Intersection Accidents versus Other Variables

10. Bivariate Statistics: 4-Legged Intersection Accidents versus Other Variables

11. Correlations between Segment Variables in MN and WA Samples

12. Correlations between 3-Legged Intersection Variables in MN and WA Samples

13. Correlations between 4-Legged Intersection Variables in MN and WA Samples

14. Correlations between Weather and Minnesota Highway Variables

15. Minnesota Segments, Poisson Models with Exposure Variables

16. Washington Segments, Poisson Models with Exposure Variables

17. Combined Segments, Poisson Models with Exposure Variables

18. Poisson Models of Segments with Lane and Surface Width

19. Poisson Models of Segments with TOTWIDTH

20. Poisson Models of Segments with TOTWIDTH, H, and VC

21. Poisson Models of Segments with TOTWIDTH, H, and VMC

22. Poisson Models for Segment Accidents

23. Additional Poisson Models for Segment Accidents

24. Negative Binomial Models for Segment Accidents

25. Negative Binomial Models for Segment Injury Accidents

26. Extended Negative Binomial Models for Segment Accidents

27. Final Extended Negative Binomial Model for Segment Accidents

28. Extended Negative Binomial Models for Segment Injury Accidents

29. Poisson Models, 3-Legged Intersections Accidents

30. Poisson Models, 4-Legged Intersection Accidents

31. Negative Binomial Models, 3-Legged Intersection Accidents

32. Negative Binomial Models, 4-Legged Intersection Accidents

33. Additional Negative Binomial Models, Combined (MN/WA) Intersection Accidents

34. Additional Negative Binomial Models, Minnesota Intersection Accidents

35. Final Negative Binomial Models, Minnesota Intersection Accidents

36. Negative Binomial Models, 3-Legged Intersection Injury Accidents

37. Negative Binomial Models, 4-Legged Intersection Injury Accidents

38. Logistic Model for Serious Accident Probability, Minnesota Segments

39. Logistic Model for Serious Accident Probability, MN 3-Legged Intersections.

40. Logistic Model for Serious Accident Probability, MN 4-Legged Intersections

41. Validation of Minnesota Models with 1990-1993 Minnesota Data

42. Validation of Minnesota Models with 1993-1995 Washington Data

43. Validation of Adjusted MN Segment Model with 1993-1995 WA Data

44. Validation of Adjusted WA Segment Model with 1985-1989 MN Data

45. Validation of Combined Segment Model with 1990-1993 MN Data

46. Accident Variation by Groups of Covariates, Final Segment Model

47. Accident Variation by Groups of Covariates, Final Intersection Models

48. Cumulative Scaled Residuals versus Increasing Value of Variables, Final Models

49. Accident Reduction Factors for the Final Models

 

LIST OF FIGURES

1. ACCIDENT RATES ON NON-INTERSTATE HIGHWAYS FOR SELECTED HIGHWAY TYPES BY NUMBER OF BUSINESSES PER MILE (Cirillo, 1992)

2. A TYPICAL NEURAL NETWORK

3. A VERTICAL CURVE

4. INTERSECTION ANGLE GEOMETRIES

5. EXAMPLES OF CALCULATION OF THE ANGLE VARIABLE HAU

6. GRAPH OF ACCIDENT VARIATION BY GROUPS OF COVARIATES, Final Segment Model

7. GRAPH OF ACCIDENT VARIATION BY GROUPS OF COVARIATES, Final Intersection Models

8. CUMULATIVE SCALED RESIDUAL VERSUS EXPOSURE (MVM)

9. CUMULATIVE SCALED RESIDUAL VERSUS DEGREE OF CURVE H

10. CUMULATIVE SCALED RESIDUAL VERSUS CREST CURVE GRADE RATE VC

11. CUMULATIVE SCALED RESIDUAL VERSUS ABSOLUTE GRADE GR

12. CUMULATIVE SCALED RESIDUAL VERSUS ADT1, 3-Legged Intersections

13. CUMULATIVE SCALED RESIDUAL VERSUS ADT2, 3-Legged Intersections

14. CUMULATIVE SCALED RESIDUAL VERSUS ADT1, 4-Legged Intersections

15. CUMULATIVE SCALED RESIDUAL VERSUS ADT2, 4-Legged Intersections

 

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