A cleaner drove from Swansea to Cardiff after taking crack cocaine. Lee Bowden swerved across the M4 and when police tried to pull him over he carried on for some time, a court heard.
The 44-year-old was seen driving a silver Seat Altea erratically on January 31 between junctions 33 and 32 of the motorway. Prosecutor Simone Walsh told Cardiff Magistrates' Court: "Police received a report from a member of the public who was behind a vehicle which was moving all over the road, slowing down and speeding up.
"He stated he believed the driver was under the influence. Officers located the defendant prior to junction 30 and illuminated their blue lights but the vehicle continued. The driver did not react to either patrol vehicle. PC Mann did not believe he would stop so flashed his headlights but the defendant exited at junction 30 and continued to drive. PC Mann pulled alongside the vehicle and turned his siren on, indicating to stop. Eventually the defendant stopped and the officers put a patrol vehicle in front to prevent him making off. It was clear to both officers that he was under the influence of drink or drugs. His speech was slurred, his eyes glazed, and he appeared drowsy."