Table 58. Accident Type Distribution by Ramp Segment Type for
Urban Diamond Off-Ramps (1993 Through 1995)
| Ramp segment type | Total length (mi) |
Total accidents | Number and percentage of accidents by severity level | ||||||||
| Ran off road | Overturned | Other | Total | ||||||||
| Frequency | (%) | Frequency | (%) | Frequency | (%) | Frequency | (%) | Frequency | (%) | ||
| Normal deceleration lane Deceleration lane with mainline lane drop Ramp proper Normal acceleration lane Accleration lane with mainline lane addition Mainline weaving area Diverge area on ramp Merge area on ramp Weaving area on ramp Two-way roadway on ramp Cross-road ramp terminal (stop condition) Cross-road ramp terminal (free-flow) Frontage road connection |
13.7 1.2 32.7 0.0 0.0 0.0 0.0 0.0 0.0 0.0 - - - |
130 43 823 - - - 2 - - - 717 0 0 |
7.6 2.5 47.9 - - - 0.1 - - - 41.7 0.0 0.0 |
0 0 9 - - - 0 - - - 1 0 0 |
0.0 0.0 0.5 - - - 0.0 - - - 0.1 0.0 0.0 |
7 0 23 - - - 0 - - - 2 0 0 |
0.4 0.0 1.3 - - - 0.0 - - - 0.1 0.0 0.0 |
2 0 11 - - - 0 - - - 4 0 0 |
0.1 0.0 0.6 - - - 0.0 - - - 0.2 0.0 0.0 |
9 0 43 - - - 0 - - - 7 0 0 |
0.5 0.0 2.5 - - - 0.0 - - - 0.4 0.0 0.0 |
| Total | 47.6 | 1,719 | 100.0 | 10 | 0.6 | 32 | 1.9 | 17 | 1.0 | 59 | 3.4 |
Conversion: 1 mi = 1.61 km
Table 58. Accident Type Distribution by Ramp Segment Type for
Urban Diamond Off-Ramps (1993 Through 1995)(Continued)
| Ramp segment type | Total length (mi) |
Total accidents | Number and percentage of accidents by severity level | ||||||||||||
| Parked vehicle | Pedestrian | Bicycle | Fixed object | Other collision | Total | ||||||||||
| Fq. | (%) | Fq. | (%) | Fq. | (%) | Fq. | (%) | Fq. | (%) | Fq. | (%) | Fq. | (%) | ||
| Normal deceleration lane Deceleration lane with mainline lane drop Ramp proper Normal acceleration lane Accleration lane with mainline lane addition Mainline weaving area Diverge area on ramp Merge area on ramp Weaving area on ramp Two-way roadway on ramp Cross-road ramp terminal (stop condition) Cross-road ramp terminal (free-flow) Frontage road connection |
13.7 1.2 32.7 0.0 0.0 0.0 0.0 0.0 0.0 0.0 - - - |
130 43 823 - - - 2 - - - 717 0 0 |
7.5 2.5 47.9 - - - 0.1 - - - 41.7 0.0 0.0 |
0 0 0 - - - 0 - - - 1 0 0 |
0.0 0.0 0.0 - - - 0.0 - - - 0.1 0.0 0.0 |
1 1 5 - - - 0 - - - 2 0 0 |
0.1 0.1 0.3 - - - 0.0 - - - 0.1 0.0 0.0 |
0 0 2 - - - 0 - - - 3 0 0 |
0.0 0.0 0.1 - - - 0.0 - - - 0.2 0.0 0.0 |
15 3 66 - - - 2 - - - 18 0 0 |
0.9 0.2 3.8 - - - 0.1 - - - 1.0 0.0 0.0 |
0 0 4 - - - 0 - - - 0 0 0 |
0.0 0.0 0.2 - - - 0.0 - - - 0.0 0.0 0.0 |
16 4 77 - - - 2 - - - 24 0 0 |
0.9 0.2 4.5 - - - 0.1 - - - 1.4 0.0 0.0 |
| Total | 47.6 | 1,719 | 100.0 | 1 | 0.1 | 9 | 0.5 | 5 | 0.3 | 104 | 6.1 | 4 | 0.2 | 123 | 7.2 |
Conversion: 1 mi = 1.61 km
Table 58. Accident Type Distribution by Ramp Segment Type for
Urban Diamond Off-Ramps (1993 Through 1995)(Continued)
| Ramp segment type | Total length (mi) |
Total accidents | Number and percentage of accidents by severity level | ||||||||||||||||
| Head-on | Sideswipe | Rear-end | Angle | Left turn | Right turn | Other collision | Total | ||||||||||||
| F | (%) | F | (%) | F | (%) | F | (%) | F | (%) | F | (%) | F | (%) | F | (%) | F | (%) | ||
| Normal deceleration lane Deceleration lane with mainline lane drop Ramp proper Normal acceleration lane Accleration lane with mainline lane addition Mainline weaving area Diverge area on ramp Merge area on ramp Weaving area on ramp Two-way roadway on ramp Cross-road ramp terminal (stop condition) Cross-road ramp terminal (free-flow) Frontage road connection |
13.7 1.2 32.7 0.0 0.0 0.0 0.0 0.0 0.0 0.0 - - - |
130 43 823 - - - 2 - - - 717 4 0 |
7.6 2.5 47.9 - - - 0.1 - - - 41.7 0.2 0.0 |
0 0 0 - - - 0 - - - 0 0 - |
0.0 0.0 0.0 - - - 0.0 - - - 0.0 0.0 0.0 |
83 0 2 - - - 0 - - - 0 0 0 |
0 0.0 0.1 - - - 0.0 - - - 0.0 0.0 0.0 |
0.0 25 451 - - - 0 - - - 356 3 0 |
4.8 1.5 26.2 - - - 0.0 - - - 20.7 0.2 0.0 |
18 14 196 - - - 0 - - - 57 1 0 |
1.0 0.8 11.4 - - - 0.0 - - - 3.3 0.1 0.0 |
0 0 0 - - - 0 - - - 100 0 0 |
0.0 0.0 0.0 - - - 0.0 - - - 5.8 0.0 0.0 |
0 0 0 - - - 0 - - - 163 0 0 |
0.0 0.0 0.0 - - - 0.0 - - - 9.5 0.0 0.0 |
4 0 54 - - - 0 - - - 10 0 0 |
0.2 0.0 3.1 - - - 0.0 - - - 0.6 0.0 0.0 |
105 39 703 - - - 0 - - - 686 4 0 |
6.1 2.3 40.9 - - - 0.0 - - - 39.9 0.2 0.0 |
| Total | 47.6 | 1,719 | 100.0 | 0 | 0.0 | 2 | 0.1 | 918 | 53.4 | 286 | 16.6 | 100 | 5.8 | 163 | 9.5 | 68 | 4.0 | 1,537 | 69.4 |
Conversion: 1 mi = 1.61 km
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