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Transportation Final 4-15-09 -   3.3 Commute Trips Taken While Driving Alone

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Transportation Final 4-15-09
1. Safety
2. Preservation
3. Mobility
4. Environment
5. Stewardship
Current Conditions
Action Plan

3.3 Number of drive alone commute trips reduced through state trip reduction programs

How effective is the Commute Trip Reduction program at reducing drive-alone trips each weekday?

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Data Notes

Data Source:



WSDOT Commute Options Program Measurement of both CTR and GTECs is conducted through employee surveys. Employees at CTR sites are asked to document the commute mode choices that they made in the previous week.   For the CTR program we have surveyed between 200,000 and 300,000 employees biennially since 1992.  Baseline measurement has begun at the ten functioning GTECs; however, this data is not yet available
Measure Definition:
Target Rationale:
Link to Agency Strategic Plan: Objective 3.6 in 2009-15 SP
Notes: (optional)

Data as of September 30, 2007

Moving Washington:  A component of “Moving Washington” is managing demand.  Two WSDOT programs focused on reducing drive alone trips and vehicle miles traveled are the Commute Trip Reduction (CTR) and the Growth and  (GTEC) programs.

Also Available
Action Plan: Yes
Extended Analysis: Yes

 Display Drill Down Measures


 Summary Analysis

Commute Trip Reduction

WSDOT partners with local governments, transit agencies, regional transportation planning organizations, employers, and others to provide commute options. CTR works primarily with larger employers and is focused on reducing commute trips.

  • Nearly 1,200 worksites, with approximately 570,000 employees who commute each day, participate in the  CTR program.
  • The proportion of people who drove alone to work to CTR worksites declined 7.6% from 1993 to 2007 (from 70.9% in 1993 to 65.5% in 2007). 
  • Employees commuting to CTR worksites made nearly 26,000 fewer vehicle trips each weekday morning in 2007 than when they entered the program. If these trips were back on the system, delay could increase in the central by as much as 18%.
  • CTR's target, a sum of the goals from all the cities implementing CTR, is 34,000 trips reduced in 2011. 

 Growth and Transportation Efficiency Center

The GTEC program, established in 2006, expands the state trip reduction travel market by working with smaller employers and addressing other trip purposes, such as errands and travel to school, to  reduce single occupant vehicle commute trips.

  • For example, 90% of the employers in downtown Bellevue have 20 or fewer employees.  These employers are not covered by the CTR law, but the downtown Bellevue GTEC will work with these smaller employers.
  • Baseline data is currently being collected for the state's ten functioning GTECs. Program goals will be set when this data is collected and analyzed.
  • Initial feedback on the program’s impact has been positive.