The road index is one of the three components of the transportation index. The road index depends on the total length of roads in the country and the length of roads needed. If the length needed is equal to the length of the existing roads, the road index will move gradually to 100. The transportation index tends to move in the direction of the lower of the three partial indexes: the road index, the railroad index and the water treatment index. It does not make sense to increase only one of the three components because the transportation index will remain similar to the lowest of the three.
Increasing the road index is easy: just build new roads and the index will increase.
Simcountry Dictionary
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The road index is one of the three components of the transportation index. The road index depends on the total length of roads in the country and the length of roads needed. If the length needed is equal to the length of the existing roads, the road index will move gradually to 100. The transportation index tends to move in the direction of the lower of the three partial indexes: the road index, the railroad index and the water treatment index. It does not make sense to increase only one of the three components because the transportation index will remain similar to the lowest of the three.
Increasing the road index is easy: just build new roads and the index will increase.