A good driver will apply concentration ( the full application of mind and body to a particular endeavour , to the complete exclusion of everything not relevant to that endeavour ) at all times ; if he recognises that fatigue , for example , is getting in the way of this then it is time for a break .
Equal concentration should be applied at all speeds : you can just as easily knock down a child who steps out from between two parked cars as you pass at 30 as you might knock down a cyclist who emerges onto an A road in front of you as you approach at 60 . One always needs one's wits about !
Would you agree that some people would somewhat lose concentration on motorways? (With or without their knowledge)