the driver's handbook

Slow moving vehicles and heavy vehicles
Pic to come
Sometimes on country roads, you may encounter slow-moving
vehicles such as tractors and other agricultural machinery or bicycles.
Take extra care when approaching them as you will have less time
to decide whether to safely overtake them than with other faster
moving vehicles. Safe drivers travel at a speed that enables them to
slow or stop their vehicle to avoid a collision in situations where sight
distance is limited such as around curves and over crests. Cyclists
are extremely vulnerable road users on high speed roads and wind
created by your vehicle when overtaking can have a significant effect
on the stability of a bicycle. Always provide as much room as possible
between your vehicle and cyclist when overtaking. If possible, on
multi-laned roads, move entirely into adjacent travel lanes to overtake.
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You also often meet heavy vehicles on country roads and highways.
While long-distance vehicles typically use the main interstate routes,
livestock transporters, milk tankers and grain trucks will often be
encountered on other roads. Many heavy vehicles travel at night, which
makes it is more difficult to judge their speed and how close they are.
If you intend to overtake a long vehicle, stay well back from the rear
of the vehicle while waiting for a safe, clear overtaking opportunity.
This will allow you to see further along the road past the heavy vehicle
without having to move too far to the right. It will also reduce the risk
of having your windscreen broken from any stones flicked up by the
tyres of the truck. Watch out for trailers or caravans that may
sway from side to side. By holding back, you will also allow
vehicles approaching from the opposite direction to see
you earlier.
The Driver’s Handbook 33