Less cars in city centres and free public transport are among recommendations from an Oireachtas committe on the future of the transport sector.
The Environment and Climate Action Committee has been looking at how Ireland's carbon emission could be cut by more than half by 2030, and includes a call for large road projects to be reviewed and possibly replaced with public transport initiatives.
It also says congestion charges may be needed to reduce the number of road users.
Climate and Biodiversity Spokesperson for the Social Democrats Jennifer Whitmore says public transport should be made free to people.
"Government must make sure that everybody can make the changes they need to make, so that means making sure that there's public transport available across the country, that it is affordable to use.
"I think that there should be free public transport, particularly in off peak times or for children - I think that's something that the government should look at."
