About one in five motorists in East Anglia and the South regularly exceed the speed limit according to a survey.
In Suffolk 50mph speed limits have been brought in on the A140
Researchers spoke to more than 1,500 drivers and found that 94% of them admitted they had speeded.
They also found in the South region 23% said they regularly broke speed limits, while in East Anglia 20% did so.
Almost all drivers questioned said they have a sound knowledge of speed limits, while only 50% correctly identified the limit on a dual carriageway.
Percentage of drivers who regularly go over the speed limit
East Anglia 20%
South West 11%
North East 18%
Almost a quarter of drivers think it is acceptable to speed if they believe the limit is too low.
And a third consider speeding acceptable if there is an emergency, while 21% thought it was acceptable if there was little traffic about.
Direct Line's motor spokeswoman Emma Holyer said: "The lack of knowledge among motorists is very surprising - particularly that so many don't even know the speed limits on some UK roads.
"Not only is speeding dangerous but, as many motorists know to their expense, speed cameras exist across the UK and the points on your licence and fine incurred can be hefty."