Monaghan County Council is restricting the flow of HGVs with four or more axles through Glaslough Street and Dublin Street in Monaghan Town.
The restrictions are in effect seven days per week between the hours of 8am and 5am.
According to the local authority appropriate Road Traffic signs have been erected at the entrance to and the exit from the prohibited roads and streets in accordance with the Road Traffic Regulations 2006.
Hauliers requiring a permit for the purpose of making a delivery can apply for permits exempting them from the prohibitions and charges will apply in respect of these permits.