Plans for speed cameras on the M4 have been slammed by a Tory candidate as being for Labour's "politically correct, money-making reasons".
Speed cameras will be used to enforce the speed limit on the M4
James Gray, a candidate in the North Wilts constituency, said this was his "gut instinct" on hearing the cameras were to be installed.
From Wednesday, motorists who break the national speed limit on the Wiltshire section of the road could be fined.
A Labour party spokesman said they were there to help save lives.
"I fail to see how a speed camera can be politically correct," he said.
"Speed cameras are used as one of many means to help improve road safety in communities across the country."
But Mr Gray said if the Tories were voted into power, they would raise the speed limit on motorways to 80mph.
He said: "If speed cameras are designed to reduce accidents, then I support them.
"However if they are designed to raise revenues for the government or to be politically correct - saying 'aren't we being good putting up speed cameras' - then I don't."
The plan involves installing cameras from junctions 14 - Hungerford - to 18 - Bath - of the motorway.
Motorists caught speeding could be fined £60 and receive three penalty points.
"The M4 is virtually straight between those junctions," said Mr Gray.
"I cannot think of any dangerous stretches. I am not aware of any safety reason why cameras should be there."
But Saira Khan, of the Swindon and Wiltshire Safety Camera Partnership, said: "I'm sure Mr Gray is aware, as is everyone else, that we have to comply with the rules.
"We know that if we have cameras then the speeding rate goes down and the severity of casualties goes down too."
Paul Fox, the Liberal Democrats' parliamentary candidate, said speed camera laws should be enforced.
"They are a good thing because they are the one thing motorists take notice of and speed kills," he said.
Labour's parliamentary candidate for North Wiltshire is David Nash. He says hardly a week goes by without there being an accident between the two junctions.
"Bearing in mind the motorway is virtually straight the only reason for this has to be speed therefore I fully support the introduction of speed cameras on this stretch," he said.
Also running is Neil Dowdney for the UK Independence Party.