Table 3 Description of dataset #1 variables

Independent variables

    Number of lanes/direction

NL

-

3, 4

3.44

0.146

    Posted speed

PS

km/h

40, 60

55.93

0.145

    Curve length

CL

m

52 – 265

110.22

0.47

    Curve radius

R

m

70 -1400

341.36

0.892

    Speed on tangent

V₈₅T

km/h

48 – 87

67.68

0.135

    Tangent length

TL

m

60 – 1488

353.83

1

    Operating speed on previous Curve (n-1)

V₈₅C_(n-1)

km/h

50 – 90

68.83

0.139

Dependent variables

    Operating Speed on Curve (n)

V₈₅C_(n)

km/h

50 – 90

69.12

0.133