The Tamar Bridge and Torpoint Ferry tolls could be hiked by "any amount" without getting the go-ahead from the Government, under plans being considered.
Tolls at the crossings were last increased in March 2010, with the Tamar Tag - which offers half-price crossings - being introduced in 2007. The current toll is £1.50 for cars, or 75p for Tamar Tag users.
Plymouth City Council and Cornwall Council jointly run both the bridge and Torpoint Ferry that separate Devon and Cornwall and last month announced the discounted pre-paid electronic payment scheme to use both would increase by 80p a month.
New plans could see drivers who buy a Tamar Tag to use the crossing from Cornwall to Devon could face an 80 pence a month increase.
The committee that runs the Tamar Bridge and Torpoint Ferry say it's facing a shortfall of up to a million pounds a year. It's now looking at increasing the charge for the electronic tag. A public consultation has started this weekend and will run until 7th November.