The connection issue has resulted in traffic being queued back to Longforgan, with Perth drivers among those left waiting through the changes.
Amey and Springfield Properties have apologised after a technical issue with the traffic lights at the Swallow Roundabout has left Perthshire drivers seeing red.
Drivers approaching the A90 Invergowrie roundabout from Perth appear to have been worst affected with traffic regularly queued back to Longforgan this week.
The operating company for the North East Trunk Road network Amey is working to fix the problem and thanked the public for their patience.
The Swallow Roundabout layout changes were planning conditions imposed by Dundee City Council for the Western Gateway development, which housebuilder Springfield was asked to make. The developer appointed Luddon Construction Ltd to carry out the works.
In March 2025 a road safety audit highlighted several issues with the new layout. Since then Springfield, Luddon Construction, Amey and the roads authorities have been working together to resolve the issues.
On November 3, improvement works began. As part of the works, the traffic lights were temporarily switched off but have since been reactivated. However, a technical issue with the control system has resulted in traffic being queued back to Longforgan at peak times and gridlock in Invergowrie as motorists take an alternative route.
Amey and Springfield have apologised.
A spokesperson for Springfield Properties said: “We are currently working to resolve the traffic light issues at the Swallow Roundabout and apologise for any inconvenience caused. As multiple parties are involved, these works require approvals from several stakeholders before they can proceed.
“We are actively liaising with all relevant stakeholders to resolve this issue as swiftly as possible.”
An Amey spokesperson said: “The queuing traffic observed at Swallow Roundabout was due to a technical issue affecting the control system for the traffic signals, which prevented normal signal operation.
“Work is ongoing to restore the connection and return the signals to full functionality as quickly as possible. We will continue to monitor traffic flow at this location.
“We appreciate the public’s patience while this issue is resolved and apologise for any inconvenience caused.”
However, for many Perthshire drivers their patience has been tried. Perth and Kinross councillors representing the Carse of Gowrie ward have been inundated with complaints.
This week Carse of Gowrie councillor Angus Forbes received “numerous complaints from constituents about severe congestion at the Swallow Roundabout”.
The Conservative councillor said: “While some concerns relate to the period when the lights were switched off and driver behaviour, there is a clear perception that traffic flowed more efficiently when the roundabout operated without signals.
“At 8:30 a.m. today, queues extended almost to Longforgan, causing frustration for drivers and encouraging rat-running through Longforgan, Monorgan and Kingoodie.
“This places additional strain on rural roads frequently used by walkers and cyclists, creating a significant risk of accidents.
“I am still unclear whether responsibility lies with Amey or Springfield but I will be writing to both organisations to request that they urgently consider removing the lights, reinstating correct lane markings for a standard roundabout and restoring the traffic flow that worked successfully for decades.”
SNP Carse of Gowrie ward councillor Ken Harvey added: “I share the frustration regarding this, and hope a solution can be found quickly.”
While local councillor Alasdair Bailey is calling for the Scottish Government’s transport body to take control.
The Labour councillor said: “We are now well beyond the point where Transport Scotland should have taken control of this situation. They, and the Minister, need to be held accountable for this situation because the plethora of private companies delivering the works are failing to put the travelling public first.”
