Conservative MP for Waveney, Peter Aldous, has backed a campaign opposing government plans to turn the A14 into a toll road.
Suffolk Chamber of Commerce's "No Toll Tax on Suffolk" says making drivers pay to use the road would have detrimental consequences to the county.
Mr Aldous joins a growing group of people and businesses to express concern at the plans.
The government says the tax is necessary in order to carry out improvement works on the road.
Waveney MP Peter Aldous says lengthy handover delays at hospitals is one of the main factors in causing ambulance response times to grow.Mr Aldous spent two evenings with crews from the Waveney depot recently.
He says another factor he discovered was the public calling out ambulances inappropriately when they should have simply been calling their doctors. An increase in demand due to the region's ageing population was another factor.
He has written to the East of England Ambulance Trust with his findings. He has asked for a meeting with the Trust to discuss the issues.