Some of Johannesburg's public transport services will be free on Wednesday as part of national Car Free Day.

"This [free trips] will give car users an opportunity to learn more about public transport and save on petrol costs, while at the same time contributing to the reduction of emissions," city spokesman Nthatisi Modingoane said in a statement on Tuesday.

The Rea Vaya C3 Inner City Cycle Route would be offering free services from October 20 to October 23. Gautrain bus trips would also be free on October 20.

"Residents of Johannesburg are urged to take part in the celebration by using public transport such as buses, trains, taxis or joining lift clubs."

Doing so would ease traffic congestion on the roads.

He said this year's transport month was centred on the theme, "Moving Joburg to do more", which would be achieved by promoting public transport, educating people on road safety and upgrading the city's roads and storm water infrastructure.