Motorists using the A1 were forced to travel at crawling pace in the contraflow system while work takes place at the Carpenter's Lodge roundabout, near Stamford.
The works are set to last into October, with weeks of problems expected for road users.
Lane restrictions and a 40mph speed limit on the Nene Parkway at Nene Thorpe Bridge, along with improvements to the Boongate roundabout, at the junction of the A1139 Frank Perkins Parkway and Fletton Parkway, in the city extended motorists' journeys.
The scheme involves the widening of the approach roads Boongate West, Boongate East and Carr Road, as well as the installation of new signs.
For the duration of the work, there will be lane closures, but city council officials say at least a single lane will be maintained at all times, with the majority of the work being carried out between 9.30am and 3.30pm, to reduce disruption as much as possible.
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Related:
Peterborough roads chief Wayne Fitzgerald attacks 'catastrophe' claims, 24/09/08.
The full article contains 208 words and appears in Peterborough ET newspaper.