Commute Trip Reduction program

We administer the Washington state Commute Trip Reduction (CTR) law to reduce carbon emissions and traffic congestion on the state's busiest commute routes. Here, you will find links to resources for employee transportation coordinators, program administrators in jurisdictions and other stakeholders.

For employer transportation coordinators​

For jurisdiction program administrators

Commute trip reduction program guidance

How does commute trip reduction work?

CTR laws target worksites with 100 or more full-time employees who commute during peak hours in the nine most populous counties in the state. Worksites develop and manage their own programs based on:

  • Transportation demand management strategies identified as having the highest impact for their employees.
  • Locally adopted goals for reducing vehicle trips and miles traveled.

CTR surveys are conducted every other year to measure vehicle miles traveled and the mode choices at each worksite. Our Public Transportation Division and jurisdictions use these survey results to report on collective progress toward drive-alone and vehicle miles traveled reduction targets.

We provide technical assistance to jurisdictions and employers implementing CTR, lead performance-focused data analytics, develop statewide policies and practices, and support the Transportation Demand Management Technical Committee and Transportation Demand Management Executive Board.

Members of the technical committee fulfill the legislatively-mandated responsibilities of the Commute Trip Reduction Board. In collaboration with the executive board, technical committee members direct policy to support commute trip reduction strategies at worksites. The groups represent diverse perspectives of citizens, businesses, state agencies, transit agencies and jurisdictions around the state.


The Washington State Legislature passed the CTR Law in 1991. This law engaged many local communities and employers in efforts to address traffic congestion, air pollution and fuel consumption. In 2006, legislators updated the law via the Commute Trip Reduction Efficiency Act, supporting increased local authority, customization and investment.

Between 2017 and 2018, commuters at worksites participating in CTR left about 34,500 cars at home every weekday, and commuted by bus, vanpool, train, bicycle, foot or telework. During this time, these alternative commute trips reduced almost 13% of daily vehicle miles traveled per employee from 10.9 to 9.5.

This decrease in vehicle miles traveled reduces fuel usage by nearly 4 million gallons each year, saving commuters about $25 million annually. Collectively, this is an annual reduction of 75,000 metric tons in greenhouse-gas emissions equal to the amount of carbon sequestered annually by about 88,300 acres of forest. More than 1,000 worksites and 550,000 commuters participate in CTR statewide.

Traffic fatality crashes on Washington public roadways

increased 56% in March 2021 compared to March 2020.

11,906 incidents responded to

by WSDOT’s incident Response teams during the third quarter of 2021, nearly 6% more than same quarter in 2020.

WSF ridership was nearly 5.7 million in the first quarter of fiscal year 2022,

which was 1.6 million (38.3%) higher than the corresponding quarter in FY2021