A days-long protest by Greek farmers was still blocking key roads and motorways on Wednesday, with the central north-south corridor between Athens and Thessaloniki particularly badly affected.
Farmers have for months been complaining about delayed subsidy payments and are demanding additional support from the government in the face of drastically increased production costs.
Border crossings to Bulgaria, North Macedonia, Turkey and Albania have also been paralysed as farmers block the way with tractors and agricultural equipment, state broadcaster ERTnews reported.
The closures are causing considerable delays for international lorry traffic.
The largest blockades are currently centred on a transport hub in the region around Larissa in central Greece, where tractors from several areas are gathering. There are also closures in the north of the country. Drivers are having to take long detours.
In addition to timely payment of the expected subsidies, farmers are demanding fairer prices for their produce to cover increased costs.
There have already been clashes between farmers and the police in several regions. The police used tear gas and made arrests in an attempt to prevent new roadblocks.
The farmers have announced that they will continue their protest action over Christmas and into the New Year unless the government makes concrete promises to help them.