Trip Reduction Ordinances/Regulations

The National Center for Transit Research (NCTR)'s National TDM and Telework Clearinghouse has compiled a list of nearly 40 trip reduction ordinances (TROs).  The Clearinghouse has compiled summaries of these TROs into an online database.  The purpose of the database is to provide examples of various ordinances that local and state governments have applied to transportation demand management. The following information is provide on the TROs (when available):

bulletTitle of ordinance 
bulletTitle Reference
bulletWeb Address
bulletPopulation Size being effected
bulletGeographical area being affected
bulletConditions that warranted TRO development
bulletDate TRO was adopted
bulletDate TRO was appealed or overturned
bulletDate (s) TRO has been revised
bulletDetails of any revisions
bulletGoal (s) of TRO
bulletHours TRO is in effect
bulletMeasurable objectives of TRO
bulletAny evaluation or documented level of achievement
bulletDescription of Requirements
bulletThe managing entity of the TRO
bulletMonitor of TRO
bulletEnforcement policies or response of noncompliance
bulletTRO's source of funding

We also recognize that the goals and objectives for these ordinances or regulations will vary so we've provided a variety of means for obtaining information on the various trip reduction ordinances based on your interests. Simply click on the appropriate link below.

    Obtain a List of Ordinances by:

bullet Impetus
bullet Population
bullet State
bullet Year of Adoption

We strive to keep this trip reduction ordinance database continually up-to-date so that accurate information is provided.  It is our goal to make this database comprehensive and inclusive of all existing trip reduction ordinances.  If you know of the existence of TROs for other municipalities that are not included here, or if you believe that the information provided here is incorrect, incomplete or out-of-date, please let us know by completing Add-a-TRO form or by sending an email to Thank you!

Some of the more well-known trip reduction regulations include:

Rule 2202 (Southern California)

Rule 2202 has been designed to reduce emissions from mobile sources. The rule provides employers with a menu of options that they can choose from to implement and meet the emission reduction target (ERT) for their worksite. 

The various emissions reduction strategies and trip reduction strategies currently contained in the rule that employers can implement and receive credit towards their ERT's are listed below. 

bulletOld Vehicle Scrapping
bulletPeak Commute Trip Reduction
bulletClean on-road vehicles
bulletOther Work-Related Trip Reduction
bulletClean off-road mobile Equipment 
bulletVehicle Miles Traveled (VMT) Programs
bulletRemote Sensing
bulletAlternative Fuel Vehicles 
bulletOther Mobile Source Credit Programs (Regulation XVI) 
bulletAir Quality Investment Program
bulletEmission Reduction Credits from Stationary Sources (Regulation XIII) 

As an alternative to meeting the ERT at their worksite the rule allows the employers optional implementation of an Employee Commute Reduction Program. Implementation details of this strictly optional program are included in the Employee Commute Reduction Program Guidelines. This document outlines the framework, calculation methodology, and criteria used in determining emission reductions credits and vehicle trip emission credits (VTECs) that can be applied towards meeting emission reduction targets (ERT)

Commute Trip Reduction (State of Washington)
Affected employers are asked to measure their progress against the average vehicle miles traveled (VMT) and single occupant vehicle (SOV) commute trips made by employees at worksites in their area. The CTR Program establishes target commute trip reduction goals of 20 percent by 1997, 25 percent by 1999, and 35 percent by 2005. 

Maricopa County Trip Reduction Program (Phoenix, AZ)
Large employers must implement all trip reduction and/or equivalent emissions reduction measures approved by the Task Force to: 1) maintain a rate of single-occupancy vehicle trips or rate of single-occupancy vehicle miles traveled for employees of not more than sixty percent, or 2) attain target reductions in single-occupancy vehicle trips or single-occupancy vehicle miles traveled. The first year target will be a ten percent reduction from the baseline established for the rate of single-occupancy vehicle trips or the rate of single-occupancy vehicle miles traveled. The second through fifth year target will be a ten percent reduction from the target of the previous year; targets following the fifth year will be a five percent reduction from the target of the previous year, or 3) attain the equivalent emissions reduction target for the rate of single-occupancy vehicle trips or single-occupancy vehicle miles traveled.

Employee Commute Options (ECO) program (Portland, OR)
Under the ECO program, employers in the Portland area with more than 100 employees reporting to a single worksite must provide incentives for alternative commute options. These commute options must have the potential to reduce the number of employee cars driven to the worksite by approximately 10 percent within three years. Annual employee surveys will measure progress toward this goal. Employers comply by surveying employees to determine current commute methods, preparing a plan to meet target reduction and submitting the plan to Oregon's Department of Environmental Quality (DEQ) for approval. Compliance is based on submitting and implementing an approvable plan, or informing DEQ of the intent to accomplish the target reduction, and design and implement a program without DEQ's review. Compliance is based on whether a good faith effort was made to achieve the target reduction.

DEQ provides other possible ways for employers to comply with ECO. For some employers, these strategies may be more feasible and cost-effective than providing commute options. These might include: 

bulletReduce other vehicle traffic to or within the worksite; 
bulletReduce air pollution emissions from non-auto sources at the worksite; 
bulletLimit construction of new parking spaces (for new development only); or 
bulletPay a fixed fee.

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