Four delivery riders have died on Sydney roads in three months.

A food delivery rider was killed after being hit by a truck carrying an excavator in Redfern on Monday night.

The tragic incident brings the delivery driver death toll to five in three months, having occurred just days after Uber Eats worker Bijoy Paul died following a crash with a car at Rockdale in Sydney's south.

Uber Eats - a company whose business model relies on distancing itself from its delivery riders, referring to them as ‘partners’ rather than employees - now says it is concerned.

“On Monday evening we learned the incredibly sad news that an Uber Eats delivery partner had passed away following a road accident in the Sydney CBD,” spokesperson said.

“We notified Safework NSW and contacted our insurance team about the incident. Our thoughts are with his family and loved ones at this time.

“In isolation this fatality is devastating ... but when considered alongside other recent incidents across the on-demand food delivery sector, it is all the more concerning.

“It is clear the industry needs to do more to improve road safety, and we are committed to playing a leading role in achieving this.”

Transport Workers Union National Secretary Michael Kaine said regulations are needed, including an assessment of the work status of riders.

“This is a sector that's totally unregulated,” he told the ABC.

“You have these massive companies who force these workers to be classified as independent contractors and that means they don't get the same protections that other employees across the economy enjoy.

“The result of that is they're not trained, they don't have appropriate protective equipment, they are not provided with the safety systems that other workers are provided.

“We really need governments, the State Government, but particularly the Federal Government to step up and acknowledge this and deal with the consequences.”

Transport and Roads Minister Andrew Constance says his department is seeking discussions with food delivery companies.