Zinah,
Along with the contact at CalTrans and the head of the entire agency, I would address it to Councilman Mitch O'Farrell, State Senator Kevin De Leon, State Assemblyman Jimmy Gomez. In addition I would put the governor on it.
I would send it to all their offices.
I'd be happy to circulate a draft of the letter to all the Plata Neighborhood Watch meeting emails and ask that they sign and send a copy as well.
I am looking into setting up a non-profit that could advocate for the neighborhood and possibly contribute financially to these kinds of commonsense solutions. I'm considering a fundraiser once a year as the funding mechanism and then working with donors in the area.
I'll keep in touch on that.
Please let me know when you have the letter ready. I will double check the name of the contact at CalTrans and email you on that.
Joe Malone