Speed limits on roads throughout Cumbria could change after a wide-spread review costing £730,000.
Cumbria County Council will review the accident history on all its A and B roads over the next four years and decide whether to lower speed limits.
The study will also take into account whether vulnerable people use particular stretches of road.
After 2011 all C class and unclassified roads will be reviewed. The review has been ordered by the Highways Agency.
Ian Stewart, cabinet member responsible for highways, said: "This is a major undertaking and a welcome opportunity to rationalise speed limits on our roads.
"I'm sure a great many communities around the county will want to see whether the speed limits change in their areas."