Table 4.12. Adjustment Factor for Number of Rotated Lanes

Number of Lanes Rotated (N1)

Adjustment Factor
 (bw)

Length Increase Relative to 1 Lane Rotated  (=N1bw)

1.00

1.50

2.00

2.50

3.00

3.50

1.00

0.83

0.75

0.70

0.67

0.64

1.00

1.25

1.50

1.75

2.00

2.25

Source:  AASHTO. Green Book. 2004