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On Monday, migrants were moving along the motorway to Budapest which was later closed by police
The Greek government and the UN refugee agency have brought in extra staff and ships to deal with some 25,000 stranded migrants on the island of Lesbos.
A processing centre has been also set up on an abandoned football ground to help the migrants to get to Athens.
A Greek minister said on Monday Lesbos was “on the verge of an explosion”.
Meanwhile, hundreds of migrants broke through police lines on Hungary’s border with Serbia and started walking towards the capital, Budapest.
Scuffles had erupted at a cornfield in Roszke where a poorly equipped migrant holding centre has been set up. Stones were thrown at officers, who responded with pepper spray.
About 300 migrants were later seen walking the wrong way along a motorway, escorted by police officers, though they later agreed to be taken by bus to another reception centre.
Further south, the BBC’s James Reynolds reports queues 100m (330 feet) long of migrants waiting to pass from Macedonia into Serbia.
Hungary has become a bottleneck as thousands of migrants and refugees from the Middle East and Africa move north to claim asylum in Germany and other countries.
Hungarian Defence Minister Csaba Hende surprised even his own colleagues when he resigned on Monday, in a move correspondents say was clearly related to problems with the construction of a border fence meant to keep migrants out but which has so far proved ineffective.
Hungary had previously blocked those heading north, insisting they be registered there first as required under EU rules. But it dropped restrictions on Friday after struggling to cope with thousands camping in Budapest.
About 20,000 migrants made their way from Hungary into Austria and Germany over the weekend.
German Chancellor Angela Merkel has warned that the “breathtaking” flow of migrants into Germany will change the country in the coming years.
On Monday, officials said that the processing centre on Lesbos would operate around the clock for five days.
But on Monday night, about a dozen coastguards and riot police armed with batons struggled to control some 2,500 migrants surging towards one such ship, reported AFP news agency.
Local authorities have been overwhelmed by the migrants – mainly from Syria, say officials – who have been forced to live in squalid conditions, our correspondent adds.
Greek Migration Minister Yiannis Mouzalas warned that the island was “on the verge of explosion”.
BBC