The transportation plan update document discusses several key topics in transportation planning for the region including air quality and conformity with emissions standards, fiscal constraint analysis balancing projected costs and revenues, safety and congestion conditions analysis, assessment of alternative transportation modes and their impacts, and environmental justice and mitigation analyses. The environmental mitigation analysis identifies transportation projects with potential impacts to environmental resources through mapping and categorization of projects and their intersections with wetlands, watersheds, species habitats, cultural sites, and other protected areas.