He went on to say delivering a “frequent user discount” would be easier than deciding what geographical area would benefit.

He envisaged a discount scheme like London's Oyster card system and was confident the two public orders could deliver a discount scheme.

It came after Mr Basden, a professor in philosophy and information systems at Salford University, challenged Halton's chief executive, David Parr, on the issue of climate change.

Prof Basden challenged figures put forward by the council showing a reduction in carbon emissions saying the new bridge would increase emissions.

He also questioned toll levels and said if the toll was set too low, more people would use their cars therefore fuelling climate change.

In response Mr Parr said climate change was “very much a part of our thinking” adding “our ability to significantly improve carbon emmissions would be seriously compromised and become a much bigger challenge without it.”

Sutton Parish Council express traffic worries at Mersey Gateway Inquiry >>