5. ROAD COSTS ESTIMATES
Rolling. 0.30 -0.40. 4 Estimated costs expressed in US $/m 3 as at 1980. When transporting gravel over a distance of 10 km the total gravel costs per km may amount to US$4.70 to US$6.55 per m3 placed on the forest road, thus the cost of a 25 cm thickly gravelled 4 m …