Officials said it also caused congestion, as other tall vehicles backed up the single carriageway road.
English Heritage, which objected to the choice of route, said the single carriageway road would damage the city's 900-year-old cathedral.
The Attleborough bypass is one of the few stretches of single carriageway, and travellers cannot overtake slow-moving tractors and lorries.
BBC: NEWS | UK | England | Norfolk | Concerns over A11 bypass scheme
Of those detected, 79% were classified as light-goods vehicles, restricted to 50mph on a single carriageway and 60mph on a dual carriageway.
The report recommends a dual or single carriageway bypass should be built and ready before work starts on the new power station.
BBC: Suffolk County Council report calls for villages bypass
But many main or 'A' roads throughout Wales are single carriageway and so maintenance is the responsibility of cash strapped local councils.
He said the defendant drove across the single carriageway road into the path of the Fiesta driven by David Evans, husband of the victim.
They moved into the cottages by the Air Balloon roundabout, Birdlip, Gloucestershire, more than 20 years ago when the road was a single carriageway.
The Air Balloon roundabout sits on a single carriageway section of the A417 between Swindon and Gloucester - a route which links the M4 and M5.
Because the Department of Transport also has figures by type of road, and says the most dangerous is the single carriageway A-road, of which Northumberland certainly has a few.
The survey work will move along the route in phases but, as it is taking place alongside a single carriageway section, traffic will be managed past the works by temporary traffic lights.
Anybody using roads around the UK is asked to take note of how many hedgehogs they see - dead or alive - on stretches of single carriageway roads, on journeys of 20 miles or more.
BBC: NEWS | Science/Nature | Hedgehog numbers 'in nose-dive'
According to the A82 Partnership, there are three times the number of accidents resulting in injury per mile on the section of the road between Tarbet and Ardlui than on the average single carriageway road in Scotland.
The existing single-carriageway bridge has been criticised for not being able to cope with the volume of traffic crossing it and for limiting the size of boats that can enter the harbour underneath it.
The government says work to dual the last single section of carriageway of the A11 through Norfolk and Suffolk will be finished in two years.
The scheme to expand the road between Tonbridge and Pembury from single lanes to a dual carriageway was given preliminary approval earlier this year.
The roundabout sits on a single-lane section of the A417 dual carriageway between Swindon and Gloucester that is used as link between the M4 and M5.
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