I have noticed a hack in material usage where if you create a concrete one way road and then replace each segment with superhighay road it costs way less than making a superhighway of the same length in the first palce. So some times if I don’t have enough materials I use this hack to make my road firstly in concrete and then replace each segment with superhighway to save materials.For example a one way concrete road of length 30 costs 18 concrete and its replacement with superhighay costs 4,5 concrete for two replacements summing up to 27 concrete. A one way superhighway of length 30 costs 240,2 concrete and 48 steel.Both roads are one way and one lane and are on the same ground level.
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