no its not the bikeability way. The bikeability way is...
You should ride in position 1 (secondary to us oldies) and as soon as you see parked cars, check over your right shoulder and move to position 2 (middle) checking over your shoulder again, move to position 3 (near centre line) by the time you get to the parked cars. Checking over your shoulder is the sign to the motorist behind that you are going to move out. You should then give way to oncoming traffic, hence no need to indicate to them, and then take a wide berth past the parked cars out of the door zone and not letting cars behind squeeze past you (this is likely to put you in the centre of the opposite lane which is why you should give way to oncoming traffic).
in reality of course, you move seemlessly through the positions and your glance behind tells the driver you're moving out... But if you feel he may ignore you, there's nothing wrong in making it clear with a hand signal.