This study is a four-phase effort. Publication of this executive summary marks the completion of phases 1 and 2. H-GAC leads phase 3 of the study, which is to work with partner organizations to assist commuters and employers to develop incentives and utilize commute alternatives. Phase 4, in 2016, will include a follow-up survey to longitudinally measure utilization of commute alternatives and opinions. Researchers will contact the panel of 4,550 commuters who agreed to take a follow-up survey. The panel represents a wide swath of the region geographically and is representative of respondents to the first survey. View a summary report of follow-up panel characteristics here.