My sympathies. I grew up near Burbank and Fallbrook and I remember that offramp always being an issue for bicyclists. Good luck with CalTrans.
Have you considered talking with your state assemblywoman? They are currently ajourned so she should be in her regional office.
Assemblywoman Fran Pavley (Dem)
41st Assembly District
District Address
6355 Topanga Canyon Blvd.
Suite 205
Woodland Hills, CA 91367
(818) 596-4141
Ask her what issues she has that are more important than the safety of her constituents.