Research Article
A Quasi-Poisson Approach on Modeling Accident Hazard Index for Urban Road Segments
Table 2
Estimation results for the quasi-Poisson models.
| Coefficients for parameters | Fatal-injury () | Property-damage-only () | Coefficient | stat. | Coefficient | stat. |
| Explanatory variables | | | | | Intercept | −2.533 | −17.383 | −0.713 | −3.839 | Road segment in rural areas* | | | | | Road segment in urban areas | −0.393 | −2.844 | # | # | Intersection density | 0.100 | 5.922 | 0.130 | 11.310 | Ownership at state or federal levels* | | | | | Ownership at other levels | 0.275 | 1.974 | 0.441 | 3.991 | Pavement condition rating | # | # | −0.100 | −2.141 | Percent average daily trucks | −0.083 | −4.305 | −0.085 | −5.071 | Dispersion parameter | | | | | | 3.096 | | 16.415 | |
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# Indicates that the coefficient is statistically insignificant.
*Reference categories.
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