Cross-party MSPs have pledged to introduce Bills aimed at scrapping charges on Scotland's two remaining toll road bridges.
Measures to scrap the tolls are planned for later this year.
Tolls were removed on the Erskine Bridge, near Glasgow, at the weekend.
A Scottish Executive review decided to keep tolls on the Forth and Tay bridges but ministers may revisit the issue.
However, it has been claimed that ministers want put the issue of the remaining tolls off until after next year's Holyrood elections.
Coalition party MSPs in Fife and Dundee have already expressed concerns that bridge tolls remain in their area.
'Matter of fairness'
Labour Dunfermline East MSP Helen Eadie has already sent a draft Bill proposal to Holyrood to scrap the tolls, while SNP Mid-Scotland and Fife MSP Bruce Crawford has outlined a timetable for lodging his own member's Bill at the start of September.
Ms Eadie's proposal has been backed by Labour's three other Fife members at Holyrood and the party's Dundee West MSP Kate Maclean.
Mr Crawford said: "This is a simple matter of fairness and equity of practice across Scotland.
"The tolls have been removed from both the Skye and Erskine Bridges and must now go on the Forth and Tay."
A Scottish Executive spokesman said the latest phase of the bridge tolls review had looked at the management, operation and maintenance of Scotland's tolled bridges.
He added: "The minister announced last week that there would now be an examination of the economic, social and environmental impact and cost of retaining or removing tolls from the Tay and Forth bridges.
"The proposals on this will be reported on as soon as possible."