Greens MP Cate Faehrmann will on Thursday give notice of a private members bill to mandate that buses be fitted with seatbelts and make further provisions regarding the safety of children travelling on school buses.
The proposed amendment to the Road Transport (Safety and Traffic Management) Act 1999 comes after two school bus crashes this month, including one at Maclean in the state's far north on Wednesday.
"The Greens bill is a wake-up call for the NSW government and a chance to take some urgent action," Faehrmann said in a statement on Thursday.
"All states except NSW and Victoria have made seatbelts on school buses mandatory, usually after a serious bus accident.
"It's inexcusable that the NSW government is still refusing to act."
The bill proposes a phase-in period to cover the most dangerous routes, including unsealed roads and roads or highways with a speed limit 80km/h or over.