Lincolnshire Road Safety Partnership spokesman John Siddle says police have stepped up patrols along the A16 Crowland bypass following an “alarming rise” in the number of casualties.
As well as seven deaths, there have been 12 serious and 28 slight injuries – compared to one death, 12 serious and 59 slight injuries in the previous five years to August 2010 when the A1073 was the main road.
Mr Siddle said A1073 had carried 5,000 vehicles a day while the new road carries more than 13,000.
He said: “There has been an alarming rise in the number of casualties on the A16 bypass and we are concerned that drivers are assuming it is safe to drive at high speed.”
He said roads are made dangerous by drivers “not driving to the conditions, driving at high speed or driving without due care and attention”.
Mr Siddle revealed the Roads Policing Unit has already issued a number of tickets and warnings to drivers.