This has probably come up before but do you think it is taught or necessary to look over your shoulder to check blindspot when changing lanes on the motorway?
I just need to add an edit. I’m specifically referring to looking over your shoulder on a motorway. Checking mirrors and blindspot is not under question
It depends on your vehicle.
I personally drive a van, most of the time. Checking over my shoulder is a waste of time. What I do need is situational awareness. I’m aware of where my blind spots are, both absolute (e.g. directly behind my back bumper) and partial (e.g. the spot down my side).
I try and keep an awareness of everything entering and leaving my blind spots. I also do 2 checks of all spots that could have problems when manoeuvring. It’s alarming how often a small car or bike can slip through blind spots, when you’re doing your checks.
Basically, know your vehicle, and do what’s appropriate to keep everyone safe.