The forest service web page still says it's open to bikes. http://www.fs.usda.gov/angeles

I'd recommend you print the front page of the forest service site and carry it with you. Be polite and friendly, and point out that the forest service has posted that the road is open to cyclists and hikers.

We had a couple CHP officers today try to tell us that the "road closed" sign applied to bikes, too, but it had nothing to do with any emergencies thursday (if that was a reason to keep people off the road, motorcycles wouldn't be allowed at all. I've been up there on days with multiple helicopter rescues of motorcyclists). They said "road closed" applies to everyone, including hikers and cyclists, but acknowledged that there's a lot of confusion among agencies, and one of them said he was actively working to get the signage clarified. I'll be writing a letter to the various agencies involved this week and will post it and recommend that others do as well. We had it happen once before, when a Forest Service LEO tried to tell us it was closed to cyclists. We talked to the District Ranger (in charge of the whole area of the forest) the following monday and were told that we were indeed allowed to ride there. If the forest is open (and it is) there's no really legitimate reason to keep cyclists/hikers off GMR/GRR. The fire roads are all open to mountain bikes and hikers (I live at the bottom of Mt Wilson, and we rode up the toll road yesterday).

And people needing rescues doesn't seem to be a factor in closing anything-- every saturday in the spring and much of the summer we're directly under the helicopter path as it goes back and forth plucking people off various points on the way to/from the second waterfall in eaton canyon. There are ~400+ rescues/year, just in eaton canyon, and each of the past several years have seen several deaths. It's still open, and I've never even seen warning signs (allegedly they put some up).