There aren’t any significant opportunities to widen roads or put in better signals. The applicant will promise to mitigate traffic with carpooling, buses, etc. That might help a little, but the traffic study mentioned above took into account all of the mitigations that Branson already employs at their Ross campus.
The truth is that it’s hard to tell a parent who is paying $41,000/year in tuition that you can’t drop your kid off at school, especially when it’s dark or rainy. It’s hard to keep students from parking in nearby neighborhoods and then carpooling the last few blocks.
These mitigations have proven ineffective in other scenarios throughout Marin.