Another cyclist, the sixth to die on the capital's roads in less than a fortnight, has been killed in a collision with a lorry in London, police said. All but one of the riders were in incidents involving a truck, bus or coach.

Emergency services were called to Camberwell Road in south-east London about midday on Monday, the Metropolitan police said. The victim, a man believed to be in his early 60s, was pronounced dead at the scene. The lorry stopped and the driver was not arrested.

The death comes came hours after police were accused of blaming cyclists for the spate of accidents after an operation on Monday morning during which officers pulled over riders at busy junctions operation on Monday morning during which officers pulled over riders at busy junctions and advised them to wear helmets or high-visibility clothing, if they were not. Neither is compulsory, and cycling groups argue that the efficacy of either in preventing accidents and injuries is debatable.

Ashok Sinha, the chief executive of the London Cycling Campaign, said the police operation was poorly thought out. He said: "This is focusing on the victim and the most vulnerable road user to adopt measures that are uncertain, at best, to protect them significantly, instead of putting every resource that is available into reducing the source of road danger in the first place.

"You could say, well, the police can't build any infrastructure. But on the other hand we do know that speeding traffic and vehicles not obeying road signals are a far greater threat to cyclists than cyclists' own actions, which is borne out by statistics.

"It does seem to me that they're not focusing on where the sources of road danger are, and they're advising cyclists on things that have an unproven protective effect anyway."

Jenny Jones, a Green party member of the London Assembly who has campaigned to make cycling safer, said she had spoken to the deputy head of the Met's traffic unit to express her worries about the operation. She said: "I told him, 'You just can't give this sort of advice, it's not scientifically valid.' He said, 'We feel we've got to do everything to save lives.' I take his point but I still feel he's wrong."

The Met said the operation, at three busy locations, was intended "provide road safety advice", with lorries and cars also stopped. One lorry was ordered to halt due to an over-inflated tyre, and several lorry drivers were found to have exceeded their allowed driving hours.

At one location, police said, more than 100 cyclists were stopped and police "offered them words of advice" on behaviour including wearing headphones or not using a helmet or high-vis jacket.

One cyclist given advice, 29-year-old Georgie Hobbs, said she felt "pretty patronised" to be pulled over and asked by a policeman if she knew there had been a spate of cycling deaths and advised about high-visibility clothing: "It struck me that the fundamental problem here is that the onus is on the cyclist."

The Camberwell Road incident follows five other cycling deaths in the capital since 5 November, when Brian Holt, a hospital porter, was in a collision with a lorry on Mile End Road in east London and another man in an incident with a double-decker bus in nearby Whitechapel. Three of the deaths took place on or adjoining cycle superhighway two, one of a series of marked routes for cyclists introduced by London's mayor, Boris Johnson.

Critics of the superhighway system say they give riders a false sense of security as they lead cyclists down main roads with, for the most part, nothing to mark the bike lane but a strip of blue paint.

Johnson himself experienced similar criticism to that faced by the police when, on Thursday, he suggested that the spate of deaths underlined the need for cyclists to obey the laws of the road. "Some of the cases that we've seen in the last few days really make your heart bleed because you can see that people have taken decisions that really did put their lives in danger," Johnson told LBC radio.

Critics argue that statistics from the Department for Transport and Transport for London (TfL), among others, show that lawbreaking by cyclists is very rarely to blame for serious accidents. TfL figures showed cyclists breaking the law was identified as a factor in just 6% of cases where a rider was killed or badly hurt.