actual knowledge established more than three years prior to commencement of proceedings, breach of duty, cyclist collided with barricade at night, date of cause of action discoverable, duty of care, light not under control of builder, negligence, orange barricades placed on unmade verge of roadway along construction site, personal injury, street lighting not at full capacity, trial judge erred in relying on principles relevant to constructive knowledge., when plaintiff knew injury caused by fault of defendant, when plaintiff knew injury sufficiently serious to justify bringing proceedings, whether builder should have known light malfunctioning, whether duty of builder to illuminate barricade or place warning signs Limitation of actions
