Seminary Interchange Information from Supervisor Kate Sears
UPDATE FROM KATE: Seminary Interchange Improvements Soon To Be Constructed
What’s Happening at the Seminary Drive Interchange?
Last winter, I let you know about planned improvements coming to the Seminary Drive interchange. Here’s a recap of these improvements and a word about the construction soon to be underway.
The Seminary interchange project includes the intersection for the northbound (Seminary Drive) off ramp to Redwood Highway Frontage Road and the northbound on ramp to Highway 101. Accident history at this location necessitated these improvements to give drivers better direction about how to proceed through the intersection safely.
Residents, patrons and visitors to Strawberry Village and frontage road businesses will soon see a host of improvements including:
- new roadway paving and asphalt and intersection striping - both added and refreshed - to improve bicycle and pedestrian safety
- approaching the intersection from the north, a dedicated 4-foot wide bike lane for southbound Redwood frontage road cyclists
- newly installed ADA curb ramps and cross walk re-striping to align with this improvement
- realignment of vehicle lanes south of the intersection to allow for bike lanes in both directions
- traffic signal hardware and lighting upgrades as well as signal timing optimization for the new intersection configuration
- installation of an audible pedestrian signal along with new pedestrian push buttons to make crossing safer.
Construction Timing and Notifications
Construction is expected to begin in late February 2016. Although the County approved a contract with Ghilotti Construction Company on September 16, 2015, there is a 20 week lead time to fabricate the traffic signal lighting and equipment hardware. Once materials are received in February, construction is anticipated to start in late February 2016 and proceed through May 2016.
Nearby property owners (residents and business owners) project will receive written notices from the contractor prior to the start of work in February 2016. Public notices will also be sent to the Strawberry Recreation District and the Strawberry Design Review Board, DeSilva Island Homeowners Association, emergency services, utility companies, local garbage collection agencies and the US Post Office.
During construction of the ADA curb ramps at the intersection, pedestrian and bicycle access through the project will be assured. Construction hours will be from 8:00 AM to 5:00 PM. Should planned work affect access to the US-101 north on ramp necessitating closure of the Seminary Drive off ramp, it will be performed only at night between the hours of 9:00 p.m. and 6:00 a.m. Sunday to Thursday, as required by Caltrans.
Night work, anticipated to occur towards the end of the project in April and/or May 2016, may include pavement grinding, paving operations, traffic striping and some traffic signal upgrade work. If needed, detoured vehicle traffic will be directed one exit north to Highway 131 (Tiburon Boulevard) during night work with changeable message boards (CMS) and other detour signage.
Stay in Touch and Share with Friends
Thanks to everyone for supporting these long sought roadway, bicycle and pedestrian improvements. Each incremental improvement helps us achieve a more connected community. Please share this update, especially if you know families with children attending Mill Valley Middle or Tamalpais High School who may wish to know about these roadway, bicycle and pedestrian improvements and the construction taking place in the meantime to get us there.
While you’re at it, urge them to sign up for my District Three news and information here so that they’re receiving my updates regularly.
Let me know what you think by writing me at or calling (415)473-7331. I look forward to seeing you at upcoming meetings or out and about in this New Year 2016.