Thanks for asking the question. I was a passenger in a motorway accident where while the driver was performing an overtaking manouver was looking over thier shoulder and rear ended the car in front who suddenly broke. Isn’t your primary responsibility to make sure the road in front of you is clear? (The direction in which the vehicle is travelling. When reversing is it not more efficient to look over your shoulder than using your mirrors.

I agree with the unpopular comment made by https://lemm.ee/u/SwearingRobin (Sorry, don’t know how to properly link the comment)

I appreciate different situations require different behaviour but if you cannot maintain the 3 second rule so should your driving style be adapted?