only one intersection instead of the two one-way intersections, which in rural or suburban areas can be turned into a single-point urban interchange. This in turn reduces waiting time for motorists at traffic lights on the smaller road, which may be a large local thoroughfare with heavy traffic. See also References External links City of Carmel, Indiana, USA, Roundabouts (or dogbone interchanges) page Diverging Diamond Interchange Informational Guide Federal Highway Administration Road interchanges Road junction types de:Anschlussstelle (Autobahn)#Parallelrampen