I relearnt driving as an adult and had a driving instructor. This is what he insisted again and again and again. It's now a second nature for me to turn my head

I relearnt driving as an adult and had a driving instructor. This is what he insisted again and again and again. It's now a second nature for me to turn my head quickly and glance at the blind spot before switching lanes or turning. It's way too many times I have noticed a motorbike/bicycle has sneaked into that spot. Mirrors and adjustments are all good but this (simple) extra step avoids accidents.