PPT Slide

0 2 4 6 8 10 12 14 16 18 20 Vol/ lane(100pcph)

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 v/c ratio

Design Speed

8-Lanes

70 mph

60 mph

50 mph

4-lanes

Unstable Flow

*1900 pcpcpl

*2000 pcpcpl

Average Travel Speed

0

20

30

40

10

50

60

SPEED/FLOW RELATIONSHIPS

Figure 5-2. Speed flow relationships under ideal conditions(freeways)

Highway Capacity Manual

*Capacity passenger cars per cycle per lane vehicles per hour

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