Well, there are mountain lions in the surrounding area, but my guess is they stay out of the tunnel.

I like the idea of the yellow warning lights. That would be a great idea.

And yes, the Arroyo Quemada bridge is the one you experienced, Brian. It's between Gaviota and Refugio on the Southbound side of 101. We drove through it yesterday and despite about 4 No Passing on Bridge signs the person in front of us passed someone on the bridge. But at least you could wait for a gap in traffic. I don't know if you can determine with much certainty if there's a gap in the traffic before the tunnel.