They believe it's the highest level ever recorded in Rhode Island for someone who wasn't dead.
34 year old Stanley Kobierowski was arrested early Tuesday morning after he drove his car into a highway message board on Interstate 95 in Providence.
Troopers had to carry him to the breakdown lane before taking him back to their barracks.
A trooper says a Breathalyzer test registered blood alcohol readings of .489 followed by .491.
When asked for his driver's license, troopers say Kobierowski instead handed over a credit card.
Kobierowski was released from custody after promising to appear at a court hearing Friday.
Information from ABC News and the Associated Press were used in this report.
