Separators in bike lines are needed in some complicated roads, specially those which suffer from excessive car traffic or in which cars circulate at illegal speeds. They constitute a safety element to protect cyclists and give a clear message to drivers: You must not cross this line. Easy and direct. There are a myriad of separators in urban biking ranging from different colors and shapes to incorporated issues. In the following example from Pamplona, they integrate reflective elements (the gray stripes) so that drivers see them even in a close night. The distance between two separators was not chosen so by chance. Technicians optimized it to avoid cars intrusion into the bike line and create the psychological effect like “do not trespass this line” in the driver mind. Besides, their height improves this point in contrast to the ground level separators which can go unnoticed by car drivers.