A care assistant was caught on CCTV cameras driving down the wrong way on the M5.
Katy Homer, 26, will be sentenced next month at Wolverhampton Crown Court after pleading guilty to charges of driving with excess alcohol and dangerous driving.
Footage of the incident shows oncoming drivers flashing their headlights as Homer drove her Vauxhall Astra north on a southbound section of the M5 in the West Midlands.
Traffic police pulled the offending driver over after she exited the M5 in West Bromwich, having joined the motorway in nearby Oldbury.
Officers were dealing with a separate traffic matter in the early hours of December 4 last year when they spotted Homer leaving the motorway via an entry sliproad.
Homer, of Clent View Road, Halesowen, will be sentenced on March 28.
Commenting on the case, Inspector Dave Southam, of West Midlands Police, said: "There is no doubt how serious this incident could have been.
"CCTV footage from the time shows other vehicles having to move out of the way.
"Thankfully, due to the time of day, the motorway was not as busy as it otherwise might have been and so no significant harm was caused to others.
"Ultimately driving whilst under the influence poses a risk to both the driver and others on the road - regardless of whether it is on a motorway or a quiet side street, and this case will hopefully serve as a warning to others who make the dangerous mistake of getting behind the wheel after they've had a drink."