Thanks celtifrost. I approved the comment.
Generally, I am treated well by drivers in that canyon, but I did have a really obnoxious old Nissan pickup honk at me while descending in switchbacks on Monday. I gave him a hold back signal with my hand, but he continued on his horn and passed me in the curves. We hit a straight area with a shoulder less than a minute later...
I also sent my link to Bicycle Colorado and joined while I was there. I am realizing that are rights on the road take effort. They are not a given.
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