Shorter time restrictions to Highway 101 carpool lane hours are on the way. “I appreciate their responsiveness and recognition of the impact the current hours are having on daily travel.”Previously, carpool hours between the two counties were inconsistent. Caltrans had imposed expanded carpool hours in September to coincide with the completion of the Marin-Sonoma Narrows project. With all lanes open, there was a contiguous stretch of carpool lanes for about 52 miles between the two counties. The carpool hours were expanded to 5 to 10 a.m. and 3 to 7 p.m. on weekdays in both directions.