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13. 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.
13.1 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 – 15 m (39 ft 4 in – 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.
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