Labour MP Darren Hughes says he believes a majority of MPs would support his bill to lower the drink drive limit if it was selected from the ballot.
Mr Hughes has drafted a member's bill to reduce the legal blood alcohol limit reduce the legal blood-alcohol limit from 80 milligrams (.08) of alcohol for every 100 millilitres of blood to 50 milligrams (.05) of alcohol for every 100 millilitres of blood.
The bill has yet to be pulled from the ballot for debate in Parliament, but Prime Minister John Key has indicated it would probably be a conscience vote for National MPs, despite the Government deciding weeks ago not to lower the limit while it gathers fresh data.
Mr Hughes says his bill already has the support of Labour, the Greens, the Maori Party, United Future, the Progressives and at least one ACT MP.
He says he is encouraged that Mr Key is looking to give his MPs a free vote on the issue.