The podcast episodes explore the history, goals, and unintended consequences of the Interstate Highway System in the United States. They examine how the construction of highways has shaped urban development, impacted local communities, and contributed to climate change.

The episodes discuss the role of state transportation departments, the growing movement against highway expansion, and the push for more sustainable transportation solutions. They highlight the disparate impacts of highways on marginalized communities and the ongoing efforts to address these inequities.

Through interviews with experts like Megan Kimble, author of 'City Limits,' the podcasts delve into the complex legacy of the Interstate Highway System and the challenges of transitioning to a more equitable and environmentally-conscious transportation infrastructure.