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It is apparent from this brief description of projects in these five countries that the United States is not the only country havmg engmeers interested in concrete pavement design.
In spite of the many prestressed projects described, it is not intended to infer that these are standard designs or that they are more economical than conventional pavements for highways. They are really experiments to investigate construction methods and to determine performance characteristics.
It is not claimed that their designs are better than those in the U. S, or that they have necessarily advanced further or faster. However, closer study by American engineers of research and development in all foreign countries is recommended.