I did see some adventurous soul doing it on a unicycle once. What can you say? It's a free country!
This inaccessibility is particularly annoying since major employment centers, like Oracle and Electronic Arts, are within easy biking distance from the Belmont and San Carlos CalTrain stations.
Lately I've noticed some construction in the 101 median just north of Ralston, and with some poking around, discovered that a bike/ped overpass is in the works. Here's a piece of a map from the Belmont city website (which is here, but be warned I had to turn off noscript and every pop-up and security blocker my browser had to look at the content!).
I don't have any practical need to bike to Shores, but this will connect with a lot bayside trails that would be a fun ride.
I wish RWC would build something like this at Whipple.