A mother was nearly five times the drink drive limit as she made a journey of nearly 50 miles to support her daughter at her first driving lesson, a court heard.
But Janet Walker's driving was so erratic, police stopped her and the 53-year-old woman is now banned from the roads for four years.
She is also subject to a 17-week prison sentence suspended for two years for what district judge Adrian Lower called "thoroughly anti-social" behaviour and has lost her job as a support worker.
The judge said she had been very lucky that she hadn't hit another vehicle or a pedestrian.
"Given your intoxicated state, the consequences would have tragic for them and tragic for you," he said.
He told York Magistrates Court police stopped her on the A64 near Sand Hutton at 2.20pm on June 12 because she was driving very slowly, braking for no reason and moving from side to side of the carriageway.
A breath test gave a reading of 162 micrograms of alcohol in 100 millilitres of breath. The legal limit is 35 micrograms.
Walker, of Thornton Road, Bridlington, pleaded guilty to drink-driving, her first conviction.
The 17-week prison sentence was suspended on condition she does two years' supervision, rehabilitation activities focussed on alcohol abuse and 240 hours' unpaid work.
She must also pay £85 prosecution costs and an £80 statutory surcharge.
The judge warned her she would not automatically get her licence back at the end of the driving ban and may need medical evidence to convince DVLA she was fit to drive.
Her solicitor Harry Bayman said she had not been intending to drive home, but her daughter was about to take her first driving lesson, and she had "foolishly" decided to go and support her.
She was ashamed of her actions. In the past, she had had a problem with alcohol and had gone to AA meetings for a time before stopping.
Since being arrested, she had been to see her doctor and had contacted the alcohol self-help group again.
She had also been on anti-depressants for a long time and had family difficulties.