Police have launched a summer blitz on cyclists who disobey road rules along Sydney Road, in response to data that shows it is one of Melbourne's worst stretches for bike crashes.

Two police officers on bicycles will patrol the street full-time this summer, fining and educating cyclists, pedestrians and motorists who break the law.

Police from Operation Aware have begun targeting cyclists behaving badly. Credit:Jason South

Running red lights, not wearing a helmet, jaywalking and distracted driving will be targeted.

Almost 50 per cent of reported casualty crashes on Sydney Road in Brunswick in the past five years involved a cyclist, data shows. There were 179 incidents in that time and 85 involved a bike rider.