Pick any regular journey you do in the car. Can you name : All road names, road speeds and where they change, the number of traffic lights and which ones have filter lanes, all of the alternative routes, local police stations, fire stations, schools, parking zones, weight restrictions over any bridges, all bridge heights and bridge numbers...... Or is it a case of you know where your going in general but could pull up the technical bits when you needed them ?
On my old route in the car - yes. I could name every road that branched off (including some of the roads they led to in case of diversions); the road speed was nearly always in an urban area; exactly the number of traffic lights and roughly how long they would stay on red/green (as each one was different according to the junction); all the bus lanes, the police stations, McDonalds, petrol stations, fire stations, schools and parking zones.
Yes, in a car, bridge weights/heights not really applicable to me but knowing the diversions during bridge strikes by overheight lorries helped...
Now, when I do drive, I drive a different route which includes telegraph poles, cows in a field, unusual trees, cambers in the road (to avoid), where the speed cameras are on the motorway, and even where the sun will be at the time of day I am driving.
That's my route knowledge....
He was using "Commentary Driving"
It would help reinforce his route knowledge and mitigate against risk.
And this wasn't in any way meant as a criticism - merely an observation as I'm sure all good drivers have their own learning/retention techniques