Toll charges for buses using the Humber Bridge are to be reduced by a further 35%, it has been announced.
Millions of vehicles using the bridge generate about £18m every year
It means public buses will benefit from an overall discount of 45% until the end of March 2008, if they agree to maintain and extend their services.
Operators currently pay £10.90 each way for their vehicles to use the bridge.
The news is a boost for passengers of the X1 - the only direct service from Grimsby to Hull - which risked being axed due to the cost.
Stagecoach had been ready to withdraw the route, claiming the tolls were too high.
The Humber Bridge Board said the discount was being offered to "protect and increase local bus services for local people".
Conditions of the reduction include operators entering a formal agreement to maintain and extend their current services, which will be reviewed after 12 months.
The Humber Bridge Board pays out £15m every year in repayments for the construction loan, which it is estimated will be paid off in 2032.
Board chairman David Gemmell said: "This major decision by the board represents a significant breakthrough in finding a way forward for a much wider review of the future of the bridge and the toll charges necessary to maintain its long term future.
"We are hoping the government will respond favourably to opening the debate positively as a result of this action."