Traffic-engineering or spatial developments may cause barrier formation. Recent developments like a robust road system and Duurzaam Veilig (Sustainably Safe) bring barrier formation as well. The basic problem in barrier formation is that cyclists and pedestrians demand a fine-meshed (bicycle) network, realization or maintenance of which usually requires additional investments in for instance underpasses and bridges. How do road maintenance authorities solve this in actual practice? Commissioned by Fietsberaad, Grontmij has analysed a number of projects involving barrier formation. It appeared that barrier formation is hard to substantiate unequivocally, as regards the value of cycling connections as well as the inconvenience caused by barrier formation. Yet road maintenance authorities usually acknowledge the problems, which is a start in finding solutions. Sometimes mainly financial (an additional underpass), sometimes creative (transform an existing overpass for cars into one for cyclists), as demonstrated by examples from Weerselo, Wesepe, Vathorst and Schoondijke.