Blue ideal line painted for Amsterdam Marathon
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Organizers painted a blue line on parts of the Amsterdam Marathon course ahead of Sunday’s race to show runners the shortest measured route, particularly through bends. About seven to eight kilometres, or roughly 20% of the course, were marked overnight; straight sections were largely left unmarked.
The markings are intended to help top runners pursue a course record and to guide participants unfamiliar with the city. Tens of thousands of runners and spectators are expected. The thin blue paint is expected to wear away over several weeks, depending on weather and traffic.