Post by Roger HayterPost by JNugentIt was posited because of the assertion that nearly two yards "must" be
left laterally between vehicles..
Do you still give the same answer?
Of course. What difference do you think white paint on the road would make?
All the difference. If your vehicle is wholly within your lane, and a
different vehicle is wholly within an adjacent lane, with neither vehicle
overlapping the line at all, then it is by definition acceptable to pass
that other vehicle (or be passed by that other vehicle) without either
vehicle needing to deviate from its course. That's the whole point of
dividing a carriageway into lanes.
It is, of course, good practice for all vehicular road users to remain
centred in their lane as far as possible other than when explicitly changing
lanes or making a turning manoeuvre[1], and failing to do so is not only
inconsiderate but potentially dangerous (because it makes you vulnerable to
a vehicle straying out of an adjacent lane). And if you are about to pass a
vehicle which is not exhibiting good lane discipline (eg by getting very
close to the divider with your lane, or clearly weaving within its own lane)
then it can be sensible to move over a bit yourself, just in case they do
actually cross the line. But there's no general requirement to disregard
normal lane discipline under normal circumstances just because the vehicle
in the adjacent lane is a bicycle.
Where a carriageway is not divided into separate lanes, and you wish to
overtake a narrow vehicle (such as a bicycle) ahead of you, then the
recommendation is to give at least 1.5m spacing because that's the spacing
that separate lanes will typically give. And yes, that does mean that if you
can't give that much spacing without entering the oncoming carriageway, but
are unable to do so because of oncoming traffic, then it isn't, at that
point, safe to overtake - you need to wait until the oncoming carriageway is
clear for you to move into, just as you would when overtaking a wider
vehicle such as a car or tractor. But you only have to make that estimation
when it isn't already marked out for you. If it is marked out as lanes, you
have a reasonable presumption that the lanes can be relied on to give
sufficient separation for normal road users.
[1] Other than vehicles carrying abnormal loads, obviously, but those are a
special case for all sorts of highway regulations, not just lane discipline.
Mark