This report is a review of the literature on cyclists who ride in large groups or bunches on public roads. The research was conducted following the Victorian State Coroner’s investigation into the death of an elderly pedestrian, following a collision with a cyclist who was riding in a bunch. The aims of the review were to understand the behaviour of bunch riders, particularly the behaviours that may contribute to increased risk of collision and to make recommendations for effective enforcement and countermeasure strategies for this road user group.