InterPlan is now part of Parametrix.

During the transition, you can browse InterPlan’s past work on this website.

To learn more about Parametrix, please visit


Many of our projects entail a relationship with clients spanning a year or more. When a city Transportation Master Plan, State Route corridor study or Environmental Impact Study (EIS) is completed we periodically highlight it in an electronic newsletter. Previous such writings can be viewed via the links below.