If you ever have to do a left turn off of that road you are describing, scan, scan and scan again! It's easy to mis-judge how fast a car is coming up behind you, think you have plenty of room and that they have plenty of time to see you & slow down for you, only to discover that they saw you but decided to pass you instead of slowing down for you. That makes for an ugly left turn situation.
Keep an eye out for right-hooks too, where someone roars past you only to practically slam on their brakes, cut you off and turn right, right in front of you.
2009 Trek 7.2FX WSD, brooks Champion Flyer S, commuter bike