State factor

Average speed ( $V_s$ )

Journey time delay( $JT{D}_s$ )

Smooth

44 - $+\infty$

0.50 - 16.8

Stable

30 - 44

11.4 - 12.6

Slow(open)

26 - 30

12.6 - 14.2

Congested(open)

17 - 26

1.42 - 16.8

Very congested(open)

0 - 17

16.8 - $+\infty$