A word of safety advise for all riding RAGBRAI, get a rear view mirror and check it before moving left to make sure it’s clear. You won’t drive a car without a mirror and checking it before switching lanes of travel on a freeway. So why do it on a bike? I have one of those geeky little ones on my sun glasses but better geek then getting in a crash.
Mirrors beat trying to crank your neck around to check, especially for those of us who are older and less flexible.