Adaptation Strategies for Managing Recurring Congestion—Adding New Capacity - Road Traffic Congestion - page 232

Table 17.1 Congestion management strategies involving added capacity/physical improvements — summary of effectiveness and implementation potential

Extent of application Effectiveness Implementation issues

Strategy Substrategy Current Potential future Local Areawide Cost Noncost

barriers

Time frame

1. New roads and

roadway
widening

Moderate Moderate High High High High Mid-to long-term

2. New toll roads Moderate Moderate High High High/revenue-

generating

High Mid-to long-term

3. a. Managed lanes
(HOV, HOT,
express toll)

Construction of new HOV,
HOT, or express toll lane

Limited (four
percent of metro
fwy miles)

Moderate High High High Medium

to high

Short-term

b. Conversion of existing general

purpose lanes to HOV, HOT,
or express toll

Limited Limited Low or

negative

Low or
negative

Low to
medium/
revenue-
generating

High Short-term

c. Conversion of existing HOV

lanes to HOV or express toll

Limited (four
applications
in US)

Limited (existing
HOV lanes)

Medium Medium Low to
medium/
revenue-
generating

Medium Short-term

4. Truck-only

lanes

Limited (three
interstate miles)

Limited (high- truck-
trafc facilities)

Varies Varies High/revenue-

generating

High Mid-to long-term

5. Bottleneck

relief

Moderate Moderate High High Medium to

high

Medium Mid-to long-term

6. Intersection

improvements

Moderate Moderate (new/

reconstructs)

High Medium

to high?

Low to
medium

Low to
medium

Mid-to long-term

(continued)