Detection and low-cost engineering improvement of inconsistent horizontal curves in rural roads

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Joao Lourenco Cardoso

In this paper a presentation is made of the method recently developed in Portugal for the detection of inconsistent horizontal curves in single carriageway rural roads of the Portuguese National Road Network, and the improvement of their safety records. The method involves the determination of the consistency class for each curve on a road, and the application of a systematic treatment - involving such low cost engineering measures as marking, signing and shoulder improvement - to the curves of each class. It is intended that this method will be applied progressively to over 8700 km of national roads.

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