|
| Variables | Coefficient | t-stat | Pseudoelasticities (%) |
| Severe injury (SI) | Minor injury (MI) | No injury (NI) |
|
| Constant (SI) | −1.618 | −5.22 | — | — | — |
| Constant (MI) | −1.466 | −3.61 | — | — | — |
| Random parameter (normally distributed) |
| Dark-lighted indicator (1 if yes; otherwise, 0) (MI) | 0.693 | 2.09 | −9.77 | 35.78 | −9.77 |
| Standard deviation of the parameter density function | 1.506 | 2.06 | — | — | — |
| Heterogeneity in the mean of random parameter |
| Dark-lighted indicator (1 if yes; otherwise, 0) (MI): improper braking and steering indicator (1 if yes; otherwise, 0) | 0.998 | 1.74 | — | — | — |
| Vehicle characteristics |
| Truck indicator (1 if yes; otherwise, 0) (SI) | 0.713 | 3.46 | 12.06 | −6.25 | −6.40 |
| Truck indicator (1 if yes; otherwise, 0) (MI) | −1.607 | −3.06 | 1.02 | −39.21 | 1.02 |
| Improper braking and steering indicator (1 if yes; otherwise, 0) (SI) | 2.671 | 6.45 | 90.31 | −26.38 | −27.64 |
| Improper braking and steering indicator (1 if yes; otherwise, 0) (NI) | 2.518 | 6.37 | −76.08 | −69.30 | 35.09 |
| Improper lane changing indicator (1 if yes; otherwise, 0) (MI) | −1.773 | −3.76 | 2.12 | −14.69 | 2.12 |
| Speeding indicator (1 if yes; otherwise, 0) (NI) | −2.634 | −6.49 | 3.95 | 3.95 | −70.93 |
| Nonlocal vehicle indicator (1 if yes; otherwise, 0) (SI) | 0.544 | 2.05 | 4.86 | −2.39 | −2.49 |
| Roadway characteristics |
| Road in bad condition indicator (1 if yes; otherwise, 0) (SI) | −1.725 | −2.22 | −4.94 | 0.39 | 0.41 |
| Road in bad condition indicator (1 if yes; otherwise, 0) (MI) | −2.040 | −2.17 | 0.44 | −5.23 | 0.44 |
| Homogeneous section indicator (1 if yes; otherwise, 0) (SI) | −1.576 | −8.28 | −87.88 | 17.95 | 18.96 |
| Homogeneous section indicator (1 if yes; otherwise, 0) (MI) | −1.010 | −3.44 | 8.44 | −53.60 | 8.44 |
| Intersection indicator (1 if yes; otherwise, 0) (NI) | 1.033 | 3.50 | −11.37 | −10.45 | 4.64 |
| Ramp indicator (1 if yes; otherwise, 0) (NI) | 2.079 | 3.93 | −7.08 | −6.65 | 1.36 |
| Large downhill grade indicator (1 if −2% or less vertical grade; otherwise, 0) (SI) | −1.764 | −3.99 | −15.37 | 1.88 | 1.90 |
| Crash characteristics |
| Sideswipe indicator (1 if yes; otherwise, 0) (MI) | 1.110 | 3.84 | −8.31 | 36.09 | −8.31 |
| Head-on collision indicator (1 if yes; otherwise, 0) (NI) | −0.962 | −3.32 | 4.84 | 4.62 | −3.77 |
| Sunny indicator (1 if yes; otherwise, 0) (SI) | −1.161 | −4.67 | −28.81 | 3.42 | 3.48 |
| Medium-low visibility indicator (1 if 50–100 meters; otherwise, 0) (SI) | 0.691 | 3.33 | 16.31 | −5.46 | −5.88 |
| Low visibility indicator (1 if below 50 meters; otherwise, 0) (NI) | −0.738 | −2.69 | 4.57 | 4.07 | −3.36 |
| Dark lighted indicator (1 if yes; otherwise, 0) (SI) | −1.064 | −4.47 | −33.18 | 2.98 | 4.26 |
|
| Number of observations above and below zero generated from the random parameter | Above zero | Below zero |
|
| Dark-lighted indicator (1 if yes; otherwise, 0) (MI) | 97.14% | 2.86% |
| Goodness-of-fit measures | | |
| McFadden R-squared | 0.374 | |
|
