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.
They're calling 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.
She says the government needs to make sure that people can make the changes they need to make, by making sure there is adequate public transport across the country.