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@skydancer
optimum positioning and so many other factors that come together while riding vary so much which is why National Standard training, as opposed to cycling proficiency, rarely refers to specific measurements (apart from car door width) . Dynamic risk management is key reacting to a changing situation and understanding some principles will help make these decisions constantly and (eventually) instinctively
eg
How long do you look back for?
Depends
How often do you look behind?
Whenever you don't know what's there so you're not surprised
How long do you hold a signal for? Until its been seen
Where does a cyclist ride in the lane? depends on many factors. Lane width, traffic speed, your speed, your skills and confidence, hazards such as parked cars, sideroads...
Cycle Trainers put their clients in a variety of situations and risk asses with them possibilities