G'day
Okay, lets talk the LAW, spelt L-A-W not D-P-I
From the WA Road Code 2000 (my emphasis).
112. Keeping as far left as practicable
(1) Except where these regulations provide otherwise, a driver shall
keep the vehicle as close as practicable to the
left boundary of
the carriageway, except where 2 or more lanes marked on the
carriageway are available exclusively for vehicles travelling in
the same direction.
Points: 2 Modified penalty: 1 PU
129. Driving on or across a continuous white edge line
The driver of a vehicle (other than a bicycle or an animal) shall
not drive on, over or outside a continuous white edge line on a
carriageway unless the driver is —
(a) turning at an intersection;
(b) entering or leaving the carriageway;
(c) entering a part of the carriageway of one kind from a
part of the carriageway of another kind (for example,
moving to or from a service road or an emergency
stopping lane);
(d) overtaking a vehicle that is turning right, or making a
U turn from the centre of the carriageway, and is giving
a right turn signal;
(e) driving a slow-moving vehicle;
(f) stopping at the side of the carriageway;
(g) driving a vehicle that is too wide, or too long, to drive on
the carriageway without driving on or over the edge line;
or
(h) avoiding an obstruction
and to answer the question about riding two abreast or more, the relevant section appears to be Section 130.
130. Riding a 2-wheeled vehicle alongside more than one other
rider
(1) The rider of a motor cycle, moped, power-assisted pedal cycle
or bicycle shall not ride on a carriageway that is not a
multi-laned carriageway alongside more than one other rider,
unless the rider is overtaking the other riders.
Modified penalty: 1 PU
(2) The rider of a motor cycle, moped, power-assisted pedal cycle
or bicycle shall not ride in a marked lane on a carriageway
alongside more than one other rider, unless the rider is
overtaking the other riders.
Modified penalty: 1 PU
(3) The rider of a power-assisted pedal cycle or bicycle shall not
ride on a path alongside another rider, unless the rider is
overtaking the other rider.
Modified penalty: 1 PU
(4) If the rider of a motor cycle, moped, power-assisted pedal cycle
or bicycle is riding on a carriageway that is not a multi-lane
carriageway alongside another rider, or in a marked lane
alongside another rider in the marked lane, the rider shall ride
not over 1.5 m from the other rider.
Modified penalty: 1 PU
If I have missed anything please do correct me. Learning this stuff is good in my view.
Andrew