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DETERMINING AND MAINTAINING TRAVEL ROAD
DETERMINING AND MAINTAINING TRAVEL ROAD
Determining and traveling the road in the jobsite is an extremely important factor both for reasons of safety and for
reducing the cycle time.To ensure safety in operations, do as follows.
DETERMINING TRAVEL ROAD
As far as possible, restrict the travel road to one-way travel.
If it is impossible to keep to one-way traffic, make the road with ample width to enable trucks traveling in opposite
directions to pass each other. If it is impossible to provide a sufficient road width, provide passing places at
various points along the road.
Always design the road so that the loaded truck passes on the side closest to the hill face.
If there are curves with poor visibility along the road, set up mirrors.
In places where the road should is weak or likely to collapse, set up a sign at a point at least 1.5 m (4 ft 11 in) from
the road shoulder to warn of the danger.
It is important to set up lighting or reflectors to enable the road to be traveled at night.
The grade of slope should be kept within 10% (approx. 6°) as far as possible, and emergency escape points
should be set up on downhill slopes in case of any brake failure.
Make the road as straight as possible, and particularly in intermediate areas with curves, where the machine is
traveling at high speed, make the radius of the curve as large as possible.
Small S curves are particularly dangerous, so avoid such curves. The radius of the curve must be a minimum of
12 to 15 m (39 ft 4 in to 49 ft 3 in).
Make the radius of curves as large as possible.
Make the road wider at curves than it is in straight areas.
Make the outside of the curve slightly higher.
Be particularly careful to strengthen the road shoulder on the outside of curve.
As far as possible, design the road so that no other roads cross it. In particular, if roads cross at an angle on
slopes, a stepped difference is formed in the road. This is extremely dangerous, as it causes the machine to roll
when traveling at high speed.
Cut the slope face to provide a special road for the trucks.
MAINTAINING TRAVEL ROAD
Carry out the necessary action according to the conditions to insure that the road can always be traveled in safety.
Remove any unevenness in the travel surface, sloping to the left or right, or drooping of the road shoulder. Make
the road of ample strength and remove such obstacles as rocks and tree stumps.
Maintain the road from time to time with a bulldozer or motor grader.
Spray the road with water at suitable intervals to prevent dust from rising and reducing the visibility.
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OPERATION
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