Poisson

Negative binomial

Zero-inflated Poisson

Zero-inflated Negative binomial

No injury accidents

Passenger car volume

0.00028^*

0.00036

0.00022

0.00028

Heavy vehicle volume

0.00018

−0.00001

0.00014

0.00009

Light non-passenger car vehicle volume

0.00054

0.00066

0.00043

0.00064

Traffic speed

0.00687

0.01053

0.00392

0.0084

Number of lanes

0.1901

0.2359

0.1012

0.0567

Number of horizontal curves

0.3221

0.3715

0.2317

0.3031

Number of access roads

0.1354

0.1743

0.0939

0.1170

Injury or fatal accidents

Passenger car volume

−0.00011

−0.00011

−0.00012

−0.00012

Heavy vehicle volume

−0.00026

−0.00019

−0.00015

−0.00017

Light non-passenger car vehicle volume

0.00074

0.0010

0.00076

0.0011

Traffic speed

0.00351

0.0043

0.0021

0.0130

Number of lanes

−0.1521

−0.0971

−0.0008

−0.0991

Number of horizontal curves

0.5268

0.5031

0.5012

0.4467

Number of access roads

0.0781

0.09701

0.1075

0.0656