Congestion Management Process


As the federally designated MPO for the Vancouver/Clark County region, RTC is required by federal law to maintain a CMP, which is a systematic process for managing congestion that provides information on transportation system performance and on alternative strategies to alleviate congestion and enhance the mobility of persons and goods.

CMP Process & Products

Quality of life and economic prosperity in the region depends on efficient mobility for both people and goods. There is recognition that strategic expansion of capacity is needed at key bottlenecks. Capacity expansion should take place after lower cost efforts have been made to improve the operations of existing facilities. The CMP is intended to identify and manage congestion using performance measures to direct funding towards strategies that most effectively address congestion.

The CMP is implemented as part of the overall metropolitan planning process. The overall CMP process is displayed in the figure above.

What is Congestion?

Traffic congestion occurs where the volume of users on a facility exceeds the maximum number of vehicles a facility can accommodate. Traffic congestion is characterized by slower speeds, longer trip times, longer delay, travel time uncertainty, increased vehicular queueing, increased traffic collisions, and other congestion characteristics.

It is important to note that high traffic volumes that may result in congestion can also be a sign of economic vitality. While it may be impossible to totally remove all congestion, due to physical and financial constraints, congestion needs to be managed in order to improve throughput and reliability. The following video is an example of how managing the transportation system can maximize throughput and improve reliability:

CMS Corridors map


One of the early steps in this process is to identify the network. By identifying a network, the region can focus its efforts on corridors that are most likely to experience congestion. In our region the congestion management network includes major inter-regional and arterial corridors. These corridors form a subset of the Regional Transportation System, which includes thirty-one corridors, identified on the adjacent map.


The monitoring element of the CMP is designed as an informational tool to be used within the decision-making process. It is also intended to provide an understanding of the transportation system’s operating conditions and deficiencies and to assess the impacts of improvement strategies.

The annual Congestion Monitoring Report provides a comprehensive set of data for monitoring the performance of the transportation system. The Congestion Monitoring Report provides profiles on the travel characteristics of the regional transportation corridors. The data is translated into tables and maps that help identify deficiencies. The annual monitoring report is available from the following links:

CMP Report Archive

Prior to 2012, the supporting data was contained in an appendix of the PDF report, rather than being separately downloadable as an Excel workbook.

Congestion Management Process, 2023 Supporting Data, 55KB

Congestion Management Process, 2023 Monitoring Report, 13.4MB

Congestion Management Process, 2022 Monitoring Report, 6.68MB

Congestion Management Process, 2022 Supporting Data, 55.3KB

Congestion Management Process, 2019 Monitoring Report, 4.5MB

Congestion Management Process, 2019 Supporting Data, 83KB

Congestion Management Process, 2018 Monitoring Report, 5.9MB

Congestion Management Process, 2018 Supporting Data, 82KB

Congestion Management Process, 2017 Monitoring Report, 5.3MB

Congestion Management Process, 2017 Supporting Data, 77KB

Congestion Management Process, 2016 Monitoring Report, 5.6MB

Congestion Management Process, 2016 Supporting Data, 80KB

Congestion Management Process, 2015 Monitoring Report, 6.6MB

Congestion Management Process, 2015 Supporting Data, 83KB

Congestion Management Process, 2014 Monitoring Report, 6.2MB

Congestion Management Process, 2014 Supporting Data, 82KB

Congestion Management Process, 2013 Monitoring Report, 5.3MB

Congestion Management Process, 2013 Supporting Data, 80KB

Congestion Management Process, 2012 Monitoring Report, 5.2MB

Congestion Management Process, 2012 Supporting Data, 72KB

Congestion Management Process, 2011 Monitoring Report, 3.7MB

Congestion Management Process, 2010 Monitoring Report, 4.2MB

Congestion Management Process, 2009 Monitoring Report, 5.1MB

Congestion Management Process, 2008 Monitoring Report, 5.7MB

Congestion Management Process, 2007 Monitoring Report, 6.0MB

2006 Congestion Monitoring Report, 5.6MB

2005 Congestion Monitoring Report, 2.6MB

2004 Congestion Monitoring Report, 8.6MB

2003 Congestion Monitoring Report, 8.7MB

2002 Congestion Monitoring Report, 8.0MB

2001 Congestion Monitoring Report, 6.5MB

2000 Congestion Monitoring Report, 5.9MB