I am directly in the path of the eclipse with near maximum time. I won't be riding at that moment, however, but I will have my entire classroom of students outside - our district has provided everyone with NASA approved glasses for the event.
OK, that said, be aware that the Missouri Business Journal is reporting that traffic will be a complete gridlock in St. Joseph, Columbia, St. Louis, and the northern reaches of Kansas City. They estimate some people could be stuck in St Louis traffic for up to ten hours, which I find unbelievable. Cell service, power, and infrastructure may brown out or be sporadic. And hotels? Fuggedaboudit. Rooms were booked two years ago. I am planning on riding to work that day and chuckling at the stranded cars as I pass them if even a small percentage of this doomsday scenario comes to pass.
Heck, we'll probably wind up with cloud cover that day.