Coloured cycle lanes are used in many countries as a means to alert drivers to the possible presence of a cyclist, and also to guide cyclists along a preferred path. However, a 2008 Danish study found that coloured cycle lanes can have a detrimental effect in complex intersections (but have advantages at non-complex intersections).
A more sustainable, and better Safe System aligned, way to cater for cyclists through a complex intersection is to provide dedicated and separated bicycle facilities like protected lanes.
Photo source: TMR
Reference: Jensen, S. U. (2008). Safety effects of blue cycle Crossings: A before–after study, Accident Analysis and Prevention, 40, 742–750.