I would just add to the good advice already given to be as visible as possible, including a daylight-visible rear blinker. A car going 45 will overtake you very quickly. Probably they will be going 50 or more. I would avoid that road when busy (if it ever is), It can be harrowing when cars pass in opposite directions at that speed right as they're passing you. Looks like that is not likely. Also, do not worry about cars not being able to cross the double-yellow. They will do so if need to pass a cyclist.