Strikes have brought public transport in Athens to a halt as unions protested against austerity measures.
Commuters pooled cars and taxis to get to work as the 24-hour strike stopped all state-run urban transport services.
A general strike on Wednesday is set to ground flights, close schools and disrupt services.
The latest action is in reaction to a shake-up of Greek employment rules that includes fresh pay cuts and involuntary staff transfers in the public sector.
Parliament is set to pass the legislation. Government officials say the overhaul is required to continue receiving loans from a 110 billion euro international bailout fund.