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Table 4 Nonlinear regression models for the effect of curve radius on TTR

From: Vehicle trajectory at curved sections of two-lane mountain roads: a field study under natural driving conditions

For left-hand bends

For right-hand bends

Equations

Constant

b 1

R2

F

Sig.

Equations

Constant

b 1

R2

F

Sig.

Exponential (E)

0.326

−0.005

0.395

45.0

0.000*

Power (P)

2.549

−0.587

0.379

35.961

0.000

Logistic (L)

3.071

1.005

0.395

45.0

0.000

Inverse (I)

0.107

7.943

0.363

33.629

0.000

Power (P)

1.274

−0.423

.385

43.136

0.000

Logarithmic (L)

0.833

−0.141

0.358

32.859

0.000

  1. *P < 0.001