Page 69 - Design Considerations Based on Quantitative Risk Assessments for Slopes

Case Studies

Federal Route FT185

▪ Frequency of Failure for both FT59 and FT185 based on

JKR Incident Proformas (IP)

Overall Frequency for Up-Slopes
Overall Frequency for Down-Slopes
4.0E-03 7.0E-03
y = 0.0005x + 0.0005 6.0E-03 y = 0.0011x - 0.0004
3.5E-03
Frequency of Failure (per annum) 2.5E-03 Frequency of Failure (per annum) 4.0E-03
R² = 0.6859
R² = 0.6278
3.0E-03
5.0E-03
2.0E-03
3.0E-03
1.5E-03
2.0E-03
1.0E-03
5.0E-04
1.0E-03
0.0E+00
1 2 3 4 5 0.0E+00
1 2 3 4 5
Hazard Category Hazard Category

Note: Correlation factor should improve with more federal routes being analyzed and

included in the correlation. Those hazard category with 0 failures should not be included.