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Measuring Congestion in the Central Puget Sound Region Destination 2030, the central Puget Sound region's transportation plan, details fixes for the worst congestion bottlenecks in the region. An ongoing task in the plan is to measure how traffic conditions improve after transportation investments are made, and to identify improvements within problem areas. The Regional Council is developing ways to measure progress in implementing the Destination 2030 plan. A major goal of this work is to measure and alleviate congestion on highways and arterials using the region's Congestion Management System (CMS). The CMS provides feedback to decision makers on the best ways to make our transportation system work better. The CMS collects data on transportation system performance and develops strategies to reduce congestion and enhance the mobility of people and goods. There are many ways to measure congestion. One example is the Washington State Department of Transportation's "travel rate index" for highway and arterial corridors. The travel rate index shows how much additional time it takes to make a trip during the peak period compared to free-flow conditions. The map shows 10 regional highway segments that currently have the highest travel rate indexes in the region. Congestion is just one of many measures used to indicate how well transportation systems are working. Other measures track progress toward key goals such as: keeping the air clean and healthy, making roads and buses more safe, providing more access to transit, adequately maintaining roads and bridges, and managing growth. Together, these tools track performance so that adjustments can be made if things aren't working. For more information, contact Ralph Cipriani at (206) 464-7122 or Karen Richter at (206) 464-6343.
Note: The 10 highway segments shown on the above map have the worst peak hour congestion of all state highways in the central Puget Sound region. The travel rate index is a measure of how much longer it takes during peak time to travel a certain distance compared to free-flow conditions. 1.00 = no significant delay. 1.50 = 50% longer. 2.50 = 150% longer. Source: Washington State Department of Transportation.
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M - F - 10 a.m. - 3 p.m. - Other times by appointment - 206-464-7532 Back Issues
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