So if there's a centre line you'll keep left, but if there isn't, you won't?! What about judgement?
If the carriageway is narrow enough to not warrant a centre line...ie, a definitive marking denoting the centre..or defining the opposing carriagways..then the 'centre' of the road is an arbitrary notion...one is not 'one side or the other'....so-called 'judgement' is as variable as the individuals making that judgement. Opposing traffic must 'meet & pass safely'....
Someone driving an over-bloated 4x4 fashion wagon may well consider the 'centre' to be to the right of their driver's door.....and oncoming driver may take a different view?
If a collision occured, to argue one driver was 'on the wrong side' won't work..as who is to say exactly where thecentre of the tarmac is? Especially if the edge of the carriageway is ill-defined? [HRH Prince Charles once 'got off', so to speak, in Court after just such a collision, on that very basis]
On a wider carriageway, where the centre [ie, dividion between opposing traffic flows] is clearly marked [white lines, or whatever]...then I solely use my own side....this is out of deference to the fact that the other side is someone else's road, not mine....lane discipline, if you like? And, if my vehicle is wide enough that I need to use someone else's bit of road, the over-riding factor is the need for me to 'give way' to any opposing traffic.
Something Advanced driver Courses seem to make little of is 'perception'...ie, how other drivers, or road users, view oneself, and what one is doing?
IMHO it is important for a driver to avoid giving the impression to others that they are not going to get out of the way...or, not leave room to pass?
In other words, it doesn't matter what you yourself think and know , but rather, what the other driver thinks...?
If an oncoming driver , on seeing us, feels the need to take some evasive action because of what we are seen to be doing....it is irrelevant that we ourselves know no conflict would occur. It is how our actions are perceived by others.
Hence...as I said, where the carriageway is defined by road markings, I keep my [car/bike] to my side....in any event, I can see what I need to see from my side, without heading across the centre line into tarmac which isn't mine.
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