Civil Engineering Reference
In-Depth Information
Table 16.10 Congestion management strategies for using existing capacity more efciently
—
summary of effectiveness and implementation potential
Effectiveness
Extent of application
Implementation issues
Strategy
Substrategy
Local
Area
wide
Current
Potential future
Cost
Noncost
barriers
Time
frame
Moderate
—
extensive
(25
-
60 %
signals
optimally timed)
1.
a Traf
c signal
timing and
coordination
Traf
c signal
optimization
and
interconnection
High
Medium
to high
Extensive
(all
nonfreeways)
Low
Low
Short-term
b
Centralized,
actuated
control
systems
High
Medium
in to
high?
Limited (major
arterials
networks)
Moderate
(major
arterials.
networks)
Medium
Medium Mid-term
2.
Changeable
lane
assignments
Medium ?
Limited (<250
miles in US)
Limited
Low to
medium
High
Short-term
3.
Congestion
pricing
Variable
pricing on
existing tolled
facilities
Varies
Varies
Limited (
10
facilities in US)
Moderate (any
tolled facility)
Low/
revenue-
generating?
Low to
medium
Mid-term
*
Area wide
pricing
systems
High
High
None in US
Unknown
High/
revenue-
generating
High
Mid-to
long-term
4.
Ramp
metering
Real time
metering based
on mainline
volumes/
speeds
High
Medium
to high
Moderate (1/3
fwys in 25 metro
areas)
Extensive
(all major metro
area fwy
systems)
Low
Medium
to high
Short-term
(continued)
