This before-and-after study covers the construction of one-way cycle tracks and lanes, blue cycle crossings and raised exits. It is the biggest study of its kind so far carried out in Denmark. The effects on road safety of all types of traffic both at junctions and on road sections for both accidents and injuries are examined. The effects on the volumes of motor vehicles as well as on bicycle and moped traffic are examined with regard to the construction of one way cycle tracks and lanes. Lastly, cycle facilities impact on cyclists’ perceived risk and satisfaction on road sections and at junctions is also examined.