Aaron Antrim

Founder & CEO

Aaron’s work at Trillium continues a lifelong passion for transportation. After founding an advocacy organization dedicated to transportation choice in Northern California, Aaron realized that travelers needed better tools to understand and navigate an increasingly complicated and multimodal transportation network and started Trillium to help solve this problem. Now 10 years in, Aaron’s career in transportation covers technology, data, design, and planning work with all modes. He currently focuses on helping public transportation serve its crucial purposes and thrive in the mobility-as-a-service paradigm.

Aaron’s recent blog articles

Interview with Tim McHugh and Rhyan Schaub — Lessons from TriMet’s Hop Fastpass

In July of 2017, TriMet, along with C-TRAN and Portland Streetcar, launched HOP Fastpass as the Portland region’s fare payment system. Hop is an account-based regional fare system with a number of industry-leading features including: Application Programming Interfaces (APIs) for integrating software and components from various vendors Virtualized Fare cards (“mobile wallets”) Fare Capping The […]

GTFS-ride for transit ridership data: Learning from the GTFS Example

To develop shared languages for interoperable transit data, the question we face is not just how to invent data formats, but how to create standards and the systems around them. People ask “How can we have success on the scale of GTFS without Google?” This is an important question that state departments of transportation (DOTs), in […]

Life and Growth of Transport Data Standards – Lessons from 12 Years of GTFS

Introduction The General Transit Feed Specification (GTFS), which describes public transit routes, stops, schedules, and fares, recently celebrated its 12th birthday! Over the course of its life, the GTFS has shown the transportation industry how a data specification can gain widespread adoption to enable new applications. Of course, there are many other important parts of […]

Multimodal transportation data formats (& gaps) roundup, December 2017

This is an update to the Multimodal transportation data formats (& gaps) roundup, July 2016. How do we describe the whole transportation network? Introduction: towards comprehensive data The multimodal transportation network is greater than the sum of its parts. Abundant mode options — including public transit, bikeshare, carshare, ride hailing (TNC), rideshare, and vanpool — complement each other […]