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A ban on "unsafe lorries" in London, introduced as part of efforts to protect cyclists, has come into force.
Heavy goods vehicles (HGVs) must now be fitted with side guards to prevent cyclists being dragged underneath.
HGVs must also be fitted with a certain type of mirror to give drivers a better view of cyclists and pedestrians.
But hauliers criticised the move as a "blunt regulatory tool" and said more should be done to target a minority of rule-breakers on London's roads.
Mayor Boris Johnson said the scheme was a "life-saver".
Each breach of the ban carries a maximum £1,000 penalty and repeat offenders risk losing their operating licences.
The new rules, covering all roads in London except motorways, and operating 24 hours a day, were announced after a number of cyclists were killed in road crashes in London.