Jo Haylen, the Shadow Minister for Active Transport said principals were being forced to manage traffic around their schools because the Liberal Government had only hired 54 of the 300 new school crossing supervisors it promised at the 2019 state election.

"It's not fair that school principals should have to act as traffic cops because the Government can't get its act together and hire school crossing supervisors," Ms Haylen said.

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"The Premier has asked parents to exercise common sense, but that's hard to do at schools where there is no drop off zone, no public transport, no safe crossings; in some cases there aren't even footpaths."

But Centre for Road Safety executive director Bernard Carlon said the school crossing supervisor program was on track, with the roll out of the first 80 supervisors for this financial year almost complete.

"Every school that asked for a school crossing supervisor in the first round received one," he said.

"The program has in fact been fast tracked - rather than the initial four year commitment, all 300 new school crossing supervisors will now be in place in three years, demonstrating our commitment to some of our most vulnerable road users.

"There will be 110 new supervisors provided to schools in each of the next two financial years.

"We are finalising the list of schools that have asked for a school crossing supervisor in the next round and we expect to be able to announce those schools soon."