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I've been encouraging other trail users to bring clippers and folding saws with them on their hikes and rides. Local offices of federal land management agencies have seen budgets for trail maintenance staff slashed this year. Thus it is up to us to make up the difference.
On my rides, I carry a pair of cheapo hand clippers and this Felco folding saw. This saw is amazingly effective at trimming anything up to 5-6" thick. I've pruned back a lot of manzanita on trails near Osborne Hill in the past few months.