I got a reply! I got a reply!!

It was in my Spam mailbox so I did not see it for a bit. I got a response to my letter:

"Dear Ms. On Your Left,

Thank you for bringing this to my attention. I have asked my staff to handle your request and we will get a sign installed as expeditiously as possible.

Roxy, 
Transportation Manager
The City On Your Left Lives in"

Soon more riders and pedestrians may enjoy this quiet street that passes parks then goes up over the freeway for an easy safe bike ride to/from my house to BART, Amtrac, shopping, errands instead of taking the busy dangerous overpass.

I'm very excited. After a lot of lobbying, I tried my local bike advocacy group, local policing group ... I found the right person in the city to write to. My neighborhood is getting some signs to the safe route to transit and shopping. 

If your community is not walkable bikeable, just do it yourself.