Civil Engineering Reference
In-Depth Information
Fig. 12.3 Freeway system evaluation by density contours charts.
Source
Reference [
3
]
by state transportation and highway agencies. This example de
nes unstable
fl
ow as
40
ow (hence reduced produc-
tivity) when density exceeds 60 passenger cars per lane-mile [
3
].
60 passenger cars per lane per mile, and forced
fl
-
