Caltrans has presented possible strategies to address the increasing difficulty and cost of keeping Highway 1 in Marin and Sonoma Counties open in the face of climate change. 

A new 20-year draft plan the department of transportation released this month provides a “narrative” for the segment of highway, said Josephine Hsai, an associate transportation planner for Caltrans. 

“It helps us to get a better idea for what types of projects to work on. It’s like…