This map is an excellent example of Roman Road building. Since the land on which the roadway was constructed is flat land, it is assumed that Roman Engineers built towers to sight the road's length in order to maintain the long stretches of straightaway. The four places along the road which deviate from straight lines is either a steep hill, river, or a marsh. So Roman roads did deviate from straight lines when it was necessary to do so. And it is very likely that they used towers to lay a straight line over long distances.
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