Caltrans is planning to create rumble strips through the center of 30 miles of Highway 1, and widen the roadway in 40 places, a $5 million effort to improve safety in Marin, according to the agency. Last week, the agency secured a permit for the project from the California Coastal Commission, whose analysis met the requirements for environmental review. The United States Fish and Wildlife Service has also greenlit the project, which is estimated to…