NLR OpenPATH: Open Platform for Agile Trip Heuristics
NLR's Open Platform for Agile Trip Heuristics (NLR OpenPATH™) enables people to track their travel modes—by car, bus, bike, walking, etc.—and measure their associated energy use.
Formerly known as e-mission, the NLR OpenPATH tool features continuous data collection and analysis via a smart phone app backed by a server and automated data processing. Its open nature enables transparent data collection and analysis while allowing for continuous improvement coupled with accessibility and adaptability by others.
NLR OpenPATH empowers communities to collect and understand their own travel data while achieving place-based, locally relevant mobility goals.
Access and Use NLR OpenPATH
Study Participants
For NLR OpenPATH studies, we have installation instructions and FAQs.
Key Capabilities
- Creates end-to-end multi-modal trip diaries using sensed data; sensed data turns on and off automatically to avoid draining the phone battery
- Enables automated mode detection and trip and section segmentation
- Enables automated or customized trip labeling
- Enables users to mark the quality of the infrastructure along their routes (e.g., to report near-miss incidents)
- Enables user surveys based on individualized travel patterns
- Public dashboard functionality (e.g., CanBikeCO) allows for multi-metric program comparisons
- Deployer dashboard functionality enables program administrators to conduct real-time program monitoring
Example Uses
Travel Surveys
NLR OpenPATH enables researchers, municipalities, and other groups to conduct travel surveys. A few examples include surveys conducted in:
- Richmond, California, by the Center for Community Innovation at the University of California, Berkley, to better understand the travel patterns of low-income households and assess the impact of gentrification
- Asuncion, Paraguay, by the Department of Urban Planning at the University of California, Berkley, to collect data on travel patterns and inform a regional travel-demand model
- Sydney, Australia, by the University of New South Wales to understand changes in essential worker travel behavior.
Program Evaluation Support
NLR OpenPATH can also be used to monitor and evaluate mobility programs.
One example involves the Colorado Energy Office's Can Do Colorado E-Bike Pilot Program. NLR developed a customized version of the tool—called CanBikeCO—to determine how giving frontline workers an e-bike mobility option would affect their travel behavior, possibly contributing to a longer-term shift away from car dependence.
As part of an initial, small-scale pilot program, 12 low-income essential workers in the Denver area used the tool for 3 months, leading to the collection of a unique data set consisting of partially automated travel diaries, combining sensed and surveyed data with geographic information. The insights garnered from the small-scale pilot informed the design of the full-scale, 2-year pilot launched in 2021 in locations across Colorado. For more information, refer to the news article Pilot Program Sheds Light on E-Bike Use Patterns, Energy-Efficiency Benefits.
Contributors
NLR's K. Shankari developed the original version of the tool as part of a research project at the University of California, Berkeley, in association with its Buildings, Energy, and Transportation Systems group. Other organizations have also contributed to the development of the open-source platform: the German Research Centre for Artificial Intelligence (modified summary screen), University of Washington's Center for Accessible Technology (improved app's accessibility), and University of New South Wales (created deployer dashboard).
OpenPATH Publications
NLR publishes journal articles, conference papers, and reports about the development and use of NLR OpenPATH.
How To Cite NLR OpenPATH
If you use NLR OpenPATH for work described in a publication, please include a citation in your publication consistent with the following format:
"NLR OpenPATH: Open Platform for Agile Trip Heuristics." ([YEAR]). NLR. Accessed [DATE]: www.nrel.gov/transportation/openpath.html.
Contact
To discuss your partnership interests, explore opportunities for using NLR OpenPATH to collect opt-in travel-behavior data, or learn about our custom analyses and related resources, please contact us.
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Last Updated Dec. 6, 2025