Garbage bin collection has been suspended in The Hills, Hornsby and other council areas across Australia.
A spokesman for The Hills Council said waste management contractors Cleanaway had voluntarily grounded its entire 2800-vehicle fleet nationwide following an accident in which two people died in South Australia.
He said inspections would be carried out on every Cleanaway vehicle to ensure safety standards are met.
Hornsby Council's spokeswoman said garbage and recycling collection in Hornsby shire would also be temporarily delayed this week.
Both councils said residents should keep their rubbish bins out until they have been collected.
The Hills Council’s general manager Dave Walker said: “If your rubbish was due to be collected this morning – or later this week – make sure it stays out on the kerb.
"Cleanaway have pledged to collect the rubbish as soon as they can, and that could be on Saturday or Sunday."
Mr Walker said red-lid garbage bins would be collected as a priority, followed by the yellow recycling bin and green organic bin.
The delays would also affect council clean-up collections.
“Cleanaway collect rubbish in many council areas throughout Australia and while the delays to our garbage collection are frustrating, it is important that safety comes first," Mr Walker said.
He thanked residents for their patience.
"I want to assure them that our resource recovery staff are working closely with Cleanaway to ensure that all rubbish is collected throughout The Sydney Hills as soon as possible,” Mr Walker said.
■ Other affected councils: Blacktown and Parramatta.