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Deleted member 49549
Guest
May I offer an alternative explanation, particularly @Leslie. A traditional "torque convertor" automatic employs a hydraulic coupling rather than rotating friction plates and doesn't wear when sitting stationary in "Drive". Nor do the brakes wear while the vehicle is stationary. Equally, if you're concentrating on traffic around you you might want to control the impact of being "rooted up the hole" by coming off or going on to the brakes of your own car as it is moved. You might conceivably even want to share the force of the impact with the vehicle in front!
More defensively, I've often moved my car forward a foot or two in traffic when I had no faith that the vehicle I could see growing in my rear view mirror had judged its stopping distance correctly.
When I see a stationary queue ahead and lots of fast moving traffic behind, I ensure I slow down early and steadily, and leave a deliberate gap between me and the stationary car in front to allow the manoeuvre you do.
Having said that, the only time I recall being rear ended was when I was in a chain of about 6 cars each rear ending the other, we were in a contraflow, one car missed their exit to return to the left carriageway and decided to stop and reverse, on a busy dual carriageway contraflow!

