Timothy Howells, a 54-year-old driving instructor, crashed his car into a ditch while intoxicated on his way to a lesson. The incident occurred on the A484 between Pembrey and Kidwelly, Carmarthenshire, on Friday 20 February.
Howells, who worked as a self-employed franchisee for RED Driving School, was found to be four times over the legal alcohol limit. A roadside breath test gave a reading of 110, and a subsequent evidential test in custody recorded 132.
Passing motorists filmed the scene, with one shouting: "Plenty to drink last night or what? You can't park there mate." Howells admitted drink driving in interview, stating he was on his way to collect a pupil.
At Llanelli Magistrates' Court, he received an eight-week custodial sentence, suspended for 18 months. He was also banned from driving for 30 months, preventing him from working as an instructor.
Dyfed-Powys Police Chief Inspector Christina Fraser said Howells "was operating in a position of great trust and responsibility" and that officers worked quickly to safeguard learner drivers and other road users.
