Electronic Warning Signal Research at Hidden Intersections, June 1959

(1959) Electronic Warning Signal Research at Hidden Intersections, June 1959. Transportation, Department of

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Abstract

The highway systems of Iowa are made up of a grid like network of highways which provide some type of highway service approximately every mile with this service usually on a section line. The Primary Road System, totaling over 8,650 miles, connects every county seat, town and other major towns by an interlocking network of highways. The primary road system is generally of a much higher type than the secondary road system, intersections of primary roads with primary roads are better designed and better marked than those of primary roads with secondary roads. The better design is especially tru3 on inter sections of primary and secondary roads along the older sections of primary roads.