Robert Morris, 48, was working in Pemberton Road, Harringay, on May 30, 2022, when he was hit by the vehicle.
A joint investigation by the Health and Safety Executive (HSE) and the Metropolitan Police has since identified a number of failings.
The site had no segregation between people and moving vehicles, and no banksman was used to guide the road-sweeper.
Mr Morris’s colleague was at the wheel of the sweeper when the incident occurred.
The investigation concluded that the traffic management systems in place at the site were “inadequate and unsafe”, placing employees and members of the public at risk of serious injury and death.
Chelmsford-based Marlborough Highways Limited, which specialises in road resurfacing in London, pleaded guilty to breaches of the Health and Safety at Work Act 1974.
The company was ordered to pay a £1 million fine by City of London Magistrates’ Court on October 3, 2025.
They were also instructed to pay full costs of £6,028.
In a separate CPS case, Marlborough Highways employee Jamie Smith was prosecuted for causing death by careless driving.
He pleaded guilty and was handed a six-month custodial sentence, suspended for two years, and a one-year driving ban.
HSE principal inspector James Goldfinch said: “Our thoughts are with Robert’s family, described by his widow as ‘the centre of our world’.
“She says his children are ‘sad and angry and cheated of so much of their future’.
“Robert was entitled to return home safely from work to his family but the lack of segregation of vehicles and pedestrians by Marlborough Highways Limited meant he did not.
“This was a case where appropriate controls had been identified but were not being implemented on site.”
Their investigation revealed that the majority of transport accidents in construction arise from the insufficient segregation of pedestrians and vehicles. This can usually be avoided by careful planning, particularly at the design stage, and by controlling vehicle operations during construction work.
