Many technologies exist to provide less expensive solutions to traffic. It’s not possible to build our way out of congestion, but the following technologies can help:

Reversible Lane Control

“The City of Calgary‚Äôs lane reversals for Memorial Drive and the 5 Avenue Connector on Bow Trail have proven effective in reducing peak hour congestion and community shortcutting on key routes around the downtown core.”
Innovative Methods to Improve Traffic Flow Session / 2011 Annual Conference of the Transportation Association of Canada Edmonton, Alberta

Variable Speed Limits

variablespeed“Active traffic management systems, dubbed “Smarter Highways” by WSDOT (Washington State Department of Transportation), are a key component of the Moving Washington strategy.”
Smarter Highways variable speed limits / WSDOT Smarter Highways Program
speedflowSpeed-flow graph showing optimal speeds for maximum vehicle flow. The “sweet spot” is located between 42 and 51 mph.

Adaptive Signal Control (ASCT)

asct“On average ASCT improves travel time by more than 10 percent. In areas with particularly outdated signal timing, improvements can be 50 percent or more.”
Federal Highway Administration, “Accelerating Innovation”

Temporary Shoulder Lanes

shoulder“These benefits include a travel time reduction of up to 20 percent, a temporary increase of up to 25 percent in freeway capacity, and a high motorist acceptance of variable traffic signs given reasonable speed limits are displayed for speed harmonization.”
Efficient Use of Highway Capacity, FHWA Report FHWA-HOP-10-023, November 2010

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