Blood donation effects are now completely gone - so that's four weeks. I can donate again end of November and probably will.
I think most folks take the short cut because the regular access road is in such terrible condition. It would probably be cheaper for the Diablo association to re-pave Mt. Diablo Scenic Blvd and re-direct the riders than it would be to put in a gate to keep us out of the shortcut.
Most of the riders I've seen in there are safe and respectful and most of the residents don't seem to mind too much. The landscapers and contractors would appear to be bigger problems than the riders but maybe there are some cyclists who race through and blow stop signs and it doesn't take too many to piss off a lot of residents.
Anyway, there's no reason not to ride nice in there. I'm not sure what prompted this particular flyer but those folks obviously have the means to make it difficult for us if they wanted to.