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Table 5 Regression parameters of developed accident prediction models
From: Safety assessment of Czech motorways and national roads
M01 | \( \widehat{N}={\beta}_0\bullet {\left({AADT}_{major}\right)}^{\beta_1}\bullet {\left({AADT}_{minor}\right)}^{\beta_2}\bullet \exp (Type)\bullet \exp (Control) \) | |||||||||
ALL | INJ | FAT+SEV | SEV+SLI | FAT | SEV | SLI | PDO | |||
β 0 | 7.185 E-05 | 1.365 E-05 | 2.534 E-06 | 1.286 E-05 | 7.885 E-07 | 1.746 E-06 | 1.112 E-05 | 5.820 E-05 | ||
β 1 | 0.671 | |||||||||
β 2 | 0.337 | |||||||||
Type = crossing | 1.354 | |||||||||
= roundabout | 1.307 | |||||||||
= merging | 0.195 | |||||||||
= diverging | 0 | |||||||||
Control = no | –0.761 | |||||||||
= yes | 0 | |||||||||
M02 | \( \widehat{N}={\beta}_0\bullet {AADT}^{\beta_1}\bullet {L}^{\beta_2}\bullet \exp (Curve) \) | |||||||||
ALL | INJ | FAT+SEV | SEV+SLI | FAT | SEV | SLI | PDO | |||
β 0 | 1.326 E-03 | 2.519 E-04 | 4.676 E-05 | 2.373 E-04 | 1.455 E-05 | 3.221 E-05 | 2.051 E-04 | 1.074 E-03 | ||
β 1 | 0.772 | |||||||||
β 2 | 0.612 | |||||||||
Curve = curved | 0.624 | |||||||||
= straight | 0 | |||||||||
M03 | \( \widehat{N}={\beta}_0\bullet {AADT}^{\beta_1}\bullet {L}^{\beta_2} \) | |||||||||
ALL | INJ | FAT+SEV | SEV+SLI | FAT | SEV | SLI | PDO | |||
β 0 | 2.702 E-04 | 5.133 E-05 | 9.529 E-06 | 4.837 E-05 | 2.965 E-06 | 6.564 E-06 | 4.180 E-05 | 2.188 E-04 | ||
β 1 | 0.967 | |||||||||
β 2 | 0.699 | |||||||||
M04 | \( \widehat{N}={\beta}_0\bullet {\left({AADT}_{major}\right)}^{\beta_1}\bullet {\left({AADT}_{minor}\right)}^{\beta_2}\bullet \exp (Turn) \) | |||||||||
ALL | INJ | FAT+SEV | SEV+SLI | FAT | SEV | SLI | PDO | |||
Rural | β 0 | 4.982 E-04 | 2.392 E-04 | 4.994 E-05 | 2.284 E-04 | 1.075 E-05 | 3.919 E-05 | 1.892 E-04 | 2.591 E-04 | |
β 1 | 0.481 | |||||||||
β 2 | 0.476 | |||||||||
Turn = yes | –0.267 | |||||||||
= no | 0 | |||||||||
M05 | \( \widehat{N}={\beta}_0\bullet {\left({AADT}_{major}\right)}^{\beta_1}\bullet {\left({AADT}_{proportion}\right)}^{\beta_2}\bullet \exp (Turn) \) | |||||||||
ALL | INJ | FAT+SEV | SEV+SLI | FAT | SEV | SLI | PDO | |||
Rural | β 0 | 2.777 E-03 | 1.722 E-03 | 4.235 E-04 | 1.615 E-03 | 1.067 E-04 | 3.168 E-04 | 1.298 E-03 | 1.055 E-03 | |
β 1 | 0.907 | |||||||||
β 2 | 0.772 | |||||||||
Turn = yes | –0.558 | |||||||||
= no | 0 | |||||||||
M06 | \( \widehat{N}={\beta}_0\bullet {\left({AADT}_{sum}\right)}^{\beta_1}\bullet \exp (Legs) \) | |||||||||
ALL | INJ | FAT+SEV | SEV+SLI | FAT | SEV | SLI | PDO | |||
β 0 | 1.273 E-05 | 4.329 E-06 | 3.516 E-07 | 4.304 E-06 | 2.598 E-08 | 3.256 E-07 | 3.978 E-06 | 8.404 E-06 | ||
β 1 | 1.220 | |||||||||
Legs = 3 | –0.464 | |||||||||
= 4 | 0 | |||||||||
M07 | \( \widehat{N}={\beta}_0\bullet {AADT}^{\beta_1}\bullet {L}^{\beta_2} \) | |||||||||
ALL | INJ | FAT+SEV | SEV+SLI | FAT | SEV | SLI | PDO | |||
Rural | β 0 | 4.780 E-02 | 1.721 E-02 | 3.421 E-03 | 1.598 E-02 | 1.227 E-03 | 2.194 E-03 | 1.379 E-02 | 3.059 E-02 | |
β 1 | 0.434 | |||||||||
β 2 | 0.584 | |||||||||
Urban | β 0 | 9.142 E-03 | 3.382 E-03 | 4.687 E-04 | 3.274 E-03 | 1.081 E-04 | 3.606 E-04 | 2.914 E-03 | 5.759 E-03 | |
β 1 | 0.648 | |||||||||
β 2 | 0.713 | |||||||||
M08 | \( \widehat{N}={\beta}_0\bullet {AADT}^{\beta_1}\bullet {L}^{\beta_2}\bullet \exp \left({\beta}_3\bullet Minor\right) \) | |||||||||
ALL | INJ | FAT+SEV | SEV+SLI | FAT | SEV | SLI | PDO | |||
β 0 | 6.607 E-04 | 2.378 E-04 | 4.728 E-05 | 2.209 E-04 | 1.696 E-05 | 3.032 E-05 | 1.906 E-04 | 4.228 E-04 | ||
β 1 | 0.842 | |||||||||
β 2 | 1.094 | |||||||||
β 3 | 0.216 | |||||||||
M09+10 | \( \widehat{N}={\beta}_0\bullet {\left({AADT}_{major}\right)}^{\beta_1}\bullet {\left({AADT}_{proportion}\right)}^{\beta_2} \) | |||||||||
ALL | INJ | FAT+SEV | SEV+SLI | FAT | SEV | SLI | PDO | |||
3-leg | β 0 | 3.842 E-05 | 2.612 E-05 | 4.706 E-06 | 2.463 E-05 | 1.492 E-06 | 3.214 E-06 | 2.142 E-05 | 1.229 E-05 | |
β 1 | 1.221 | |||||||||
β 2 | 0.507 | |||||||||
4-leg | β 0 | 9.272 E-05 | 6.305 E-05 | 1.136 E-05 | 5.945 E-05 | 3.600 E-06 | 7.757 E-06 | 5.169 E-05 | 2.967 E-05 | |
β 1 | 1.278 | |||||||||
β 2 | 1.004 | |||||||||
M11 | \( \widehat{N}={\beta}_0\bullet {AADT}^{\beta_1}\bullet {L}^{\beta_2}\bullet \exp \left({\beta}_3\bullet Minor\right) \) | |||||||||
ALL | INJ | FAT+SEV | SEV+SLI | FAT | SEV | SLI | PDO | |||
β 0 | 6.543 | 4.450 E-04 | 8.015 E-05 | 4.195 E-04 | 2.541 E-05 | 5.475 E-05 | 3.648 E-04 | 2.094 E-04 | ||
E-04 | ||||||||||
β 1 | 0.885 | |||||||||
β 2 | 0.985 | |||||||||
β 3 | 0.091 | |||||||||