Public transport in the Tunisian capital ground to a halt after employees of the state transport company went on strike on Monday over delays to salary payments.
Hundreds of workers staged a protest outside the prime minister's office.
The industrial action highlights problems facing public companies as the government of President Kais Saied grapples with its worst financial crisis.
The powerful UGTT union is to hold another two-day strike involving transport workers in late January.
It says the action will be in protest against what it calls "the government's marginalisation of public companies."