147
Driving
In high altitude regions, thinner
atmosphere can reduce engine
performance so the following
restrictions will apply:
Above 1 000 metres, the stipulated
maximum permitted gross train
weight must be reduced by 10 % for
every 1 000 metres in altitude.
Example: Driving on a mountain
road of a maximum of 2 400 metres
altitude means a reduction of the
gross train weight by 20 %.
Steep gradients
Change down in plenty of time
before downhill gradients.
Remember the limited effect of the
trailer brakes. Only use the foot
brake in short intervals to avoid
overheating the brakes.
For vehicles with an automatic
transmission, if downhill mode
provides insufficient braking then
select manual mode and second or
first gear as necessary.
The overrun brake on a
trailer is not controlled by
the anti-lock braking system.
Vehicles with air conditioning
For optimum vehicle performance
when towing a trailer or driving
with heavy loads in mountainous
areas on steep gradients, switch off
the air conditioning.
3 000 m
-20 %
2 000 m
1 000 m
0 m
-10 %
0 %
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