A council has voiced its opposition to the scrapping of tolls on the Forth Bridge, despite being run by two parties in favour of the move.

In a paper submitted to a Holyrood committee investigating the Scottish Government's plans, Edinburgh City Council officials say they have "a number of concerns" about the toll abolition.

The council says the move would increase traffic congestion in the capital, make air pollution worse and lengthen queues on the bridge.

The local authority's written submission also warns that measures to deal with the impact of the road toll removal, such as building more bus lanes and reducing cross-Forth rail fares, could cost the public purse up to £20m.

Members of the Scottish Parliament's Transport, Infrastructure and Climate Change Committee will today take evidence on the Abolition of Bridge Tolls Bill from council officials from Edinburgh, Fife and Dundee.

The Edinburgh submission is significant because the authority is run by a coalition of SNP and Liberal Democrats, both of whose parties have been keen supporters of toll abolition.

The submission says: "The council has a number of concerns regarding the potential environmental impact of increased traffic levels, congestion and pollution as a result of removing all charges."

The council also points to the recently published toll impact study, which found that lifting the charge would increase traffic levels by 10%.

"This report indicates that this may lead to increased global and local traffic emissions as well as localised negative impacts in terms of noise, vibration, visual and driver amenity."

The government wants to have legislation on the statute books by the end of the year, with tolls scrapped soon after.