Drivers are currently facing severe delays on the A14 and around Ipswich while lane closures are in place on the Orwell Bridge.
National Highways is carrying out essential repair works to the major bridge, which has led to a lane being closed in both carriageways.
As a result of the closures, traffic sensors are showing delays of around 35 minutes on the major route.
The works are also having a knock-on effect around the town, with many major routes heavily congested as drivers look to avoid the A14.
Monday marks the first working day two lane closures have been in place.
The lane closures are expected to be in place until the work is completed in August.
Businesses in the town have voiced their anger over the roadworks, with one gym owner saying he has seen 30% fewer customers come in as a direct result of the lane closure on the A14 bridge and the traffic that has resulted.
Community leaders and residents have also expressed their concerns over the seven-week long project.
Lara from Pinewood, who works in Bury St Edmunds, said: "I'm absolutely pulling my hair out as I'm sure several thousand other people are.
"I can barely get off my drive. I barely slept last night worrying about getting into work this morning and set my alarm for 5.30am to try and get a head start.
"Coming home to Ipswich from Bury took me 1hr 20mins - it took 30 mins to get from the Sproughton junction on A14 to Copdock.
"It's too stressful for words."
A spokesperson for National Highways had said: "While some delays are expected, the contraflow roadworks will let us complete work as safely and quickly as possible and minimise the disruption of diverting traffic through Ipswich."
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