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Table 3 Numbers of elements and descriptive characteristics of their accident data

From: Safety assessment of Czech motorways and national roads

Element type Number Accident frequency
Min. Max. Mean Sum
Motorways
- Interchange conflict points 2550 0 172 2.39 6095
- Interchange ramps 3636 0 178 3.03 11,029
- Sections 382 1 283 55.97 21,381
National roads
- 3-leg intersections 536 0 46 5.51 2956
- 4-leg intersections 92 1 62 12.70 1168
- Roundabouts 67 0 110 11.69 783
- Undivided sections 311 0 130 25.89 8052
- Divided sections 53 0 152 10.49 556
Secondary roads
- 3-leg intersections 165 0 33 1.65 273
- 4-leg intersections 39 0 31 5.77 225
- Sections 372 0 70 9.43 3507