Maybe so but based on the number of riders and hikers I saw going through in an hour or so, they would have their hands full.
Of course they could camp out at the road gate and turn away all, but I expect they have other things to do.
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1989 Schwinn Paramount OS
1980 Mclean/Silk Hope Sport Touring
1983 Bianchi pista
1976 Fuji Feather track
1979 raleigh track
"I've consulted my sources and I'm pretty sure your derailleur does not exist"