Facility and Area Type

Freeways/Expressways

Toll Roads

HOV/HOT Lanes

Signalized Arterials

Function

Parameters

1

2

3

1

2

3

1

2

1

2

Fitted BPR

α

0.263

0.286

0.15

0.162

0.25

0.32

0.32

0.33

0.24

0.26

β

6.869

5.091

5.61

6.34

7.9

6.71

8.4

8.6

7.50

8.20

Conical

β

18.390

18.39

15.06

18.39

15.064

15.064

18.55

18.7

18.8

18.8

α

1.029

1.029

1.04

1.029

1.036

1.036

1.028

1.028

1.03

1.03

Modified Davidson

J

0.009

0.0092

0.0099

0.008

0.0099

0.0099

0.009

0.0089

0.01

0.01

µ

0.950

0.949

0.951

0.94

0.952

0.940

0.95

0.947

0.95

0.95

Akcelik

τ

0.100

0.101

0.099

0.11

0.098

0.097

0.09

0.08

0.10

0.10