Journal of Advanced Transportation / 2018 / Article / Tab 1

Research Article

Investigating the Differences of Single-Vehicle and Multivehicle Accident Probability Using Mixed Logit Model

Table 1

Descriptive statistics of response and significant explanatory variables.

Variable MeanStd. dev.MinimumMaximum

Crash type0.0080.12102
Temporal characteristic
Night0.431na01
Weekend0.271na01
November0.095na01
Time of sunset0.062na01
4 a.m.-5 a.m.0.040na01
Traffic characteristic
Low speed limit indicator (1 if speed limit is less than 55 miles per hour, 0 otherwise)0.369na01
Speed gap (speed limit minus traffic speed) (mph)2.6425.533069.18
Hourly traffic volume (in thousands per hour)2.9162.1010.0314.988
Truck percentage (%)6.2151.9222.810.7
Road characteristic
Number of entering ramps per lane per mile0.2520.21500.926
Number of lanes4.1590.56235
Curvature (degree)0.9470.68102.260
length of segment (miles)1.0140.7690.2364.5
Long remaining service life of rutting (1 if the value of rut is higher than 99, 0 otherwise)0.225na01
Inside shoulder width (in feet)9.0062.583515
Environmental and road surface characteristic
Cross wind speed4.1463.906031.98
Visibility1.0750.13601.1
Wet road surface0.082na01
Chemical wet road surface0.037na01