Lorries carrying huge wind turbine components will be travelling through Shropshire and Mid Wales six days a week for two months this summer.
The transporters, taking turbine parts to a wind farm in Mid Wales, will begin their journeys along the A483 at the end of next month, just as the summer holidays start.
One councillor fears that the convoys will put people off travelling along the trunk road, damaging the tourist trade.
A trial run of a convoy, minus the turbine parts, is taking place on June 30 with the actual deliveries starting on July 25.
Awel Newydd, owner of the Tirgwynt wind farm between Carno and Cefn Coch, said each delivery would consist of two abnormal load vehicles and a full police escort.
Travelling from Yorkshire each convoy will enter Shropshire from the Chirk bypass, travel along the Oswestry bypass then onto narrower single carriageway roads through Pant and Llanymynech.
“They will arrive in Welshpool shortly after noon and take about 15 minutes between Rhallt Lane and Raven Street depending on traffic conditions,” Sophy Fearnley-Whittingstall, for Awel Newydd said.
“We have planned for one delivery per day up to six days a week, which would take approximately two months. We are aiming to shorten this, by increasing both the frequency – to two deliveries – and size of the deliveries to three abnormal load vehicles, subject to the police deeming it is safe.”
Pant and Llanymynech parish councillor, Dilys Gaskill, said she was very concerned about traffic problems.
“I can understand why they are doing these deliveries in the school holidays, but what about the holidaymakers or people who want to use the busy A483 for a day trip into Mid Wales. I am worried about the impact on the tourist trade.”Subscribe to our Newsletter