Liberal Senator Stephen Parry yesterday issued a written, public apology after he was randomly breath tested on Saturday in Launceston and recorded a blood alcohol reading of 0.10 - twice the legal limit.

The former police officer described it as a major error of judgment.

``After demonstrating an excellent driving record for over 35 years, I have been regarded as a road safety role model, and example, to my family, friends and supporters. My actions in one misjudgment have now tarnished that role,'' he said.

``I am deeply embarrassed. There is no doubt I have let them down. I should have known better.''

Senator Parry, 51, is due to appear at the Launceston Magistrates Court on April 11.

He said he would accept the reading and any punishment meted out.

``I foolishly estimated that my blood alcohol limit was within the limit of the law. This in no way excuses my actions, rather it reinforces the message not to be too smart and think that you can accurately predict your reading, once you have consumed any alcohol and intend driving.''

Deputy Premier Bryan Green was disqualified from driving for three months after pleading guilty to drink-driving on July 25.

He formally apologised to Premier Lara Giddings and the public after recording a blood alcohol reading of 0.068.

John Gledhill, chairman of the Road Safety Advisory Council, said the latest case should serve as a warning to all Tasmanians.

``To me, the biggest thing is the danger that you place other people in and that's the message we've got to get through to people,'' he said.