If you are entering the Costco driveway at this location, and an oncoming car is a Boulder Sheriff, they take great offense at your left turn and ticket you for failing to yield the right of way. A yielding left turn is always a subjective judgement call so what are you going to argue is safe, 200 feet? 1,000 feet? Pay attention to the possibility of the officer speeding up to create more favorable conditions for a ticket. My officer claimed he had to “slam on his brakes”. I would say that could be true after he decided to ticket me and turn into the driveway behind me…