Speed cameras on a section of the M4 in Wiltshire are being credited with reducing the number of crashes where someone is killed or injured by 64%.
The Wiltshire and Swindon Safety Camera Partnership (WSSCP) claims that in three months, traffic topping the 70mph limit had dropped from 55% to 36.28%.
"This is a direct result of enforcing the limit, nothing else has been done to slow traffic," a spokesman said.
But opponents have criticised the figures as "outrageous spin".
Paul Smith, from the Safe Speed road safety campaign, said: "We need accurate statistics to allocate resources to help save lives."
In April several hundred motorists travelled in two convoys at about 56mph across a 30-mile stretch of the motorway in Wiltshire protesting about the cameras.
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