German research indicates that making one-way streets two-way for cyclists results in a reduction in the total number of collisions.[44] In Belgium, all one-way streets in 50 km/h zones are by default two-way for cyclists.[45] A Danish road directorate states that in town centres it is important to be able to cycle in both directions in all streets, and that in certain circumstances, two-way cycle traffic can be accommodated in an otherwise one-way street.[46]