Civil Engineering Reference
In-Depth Information
Fig. 12.7 Throughput volume for uncongested and congested flow for 70 mph freeway.
Source
Figure
12.6
The speed volume relationship shown in Fig.
12.8
indicates that: when the
V/C = 1.0, the 53 mph traf
c speed cannot be sustained for long. At a density of
45 pcplpm, the space between vehicles averages 97 ft [(5,280 ft per mile/45 cars/
lane-mile)
20 ft/car]. Many drivers would consider this space too short to merge
−
Fig. 12.8 Speed-volume relationship for uncongested and congested
fl
flow for 70 mph freeway.
Source
Source scale as in Fig.
12.7
