Liberal Democrat campaigner Julie Pörksen is urging parents and students affected by the post 16 transport charges to make a formal complaint.
Northumberland County Council’s new system of charging for post-16 travel to school comes into force next month despite objections from rural areas of the county.
Ms Pörksen, who has requested an intervention by the Secretary of State, said: “The Department of Education state that intervention would only be considered if complaints processes have been exhausted locally.
“I am therefore calling on parents and students who have been objecting to this policy to write into the council and make formal complaints, either about being refused free transport on an individual basis or about the wider unfairness of the policy in general.
“We can then go back to the Secretary of State and request further support.”