Antony Jones, of Hawthorn Path, Mount Estate, Milford Haven, Pembrokeshire, was convicted of rape.
Judge Paul Thomas QC told the defendant it must have been apparent to him how intoxicated his fare was and he had “cynically and callously” taken advantage of her.
He told the driver he had treated the woman “like a piece of meat for use to use sexually as you wished” and said he had had sex with her when “she was at best semi-conscious” and unaware of what was going on.
The judge said with Jones having a previous caution for assaulting a woman he ought not to have been working as a taxi driver.
Jones was sentenced to 10 years in prison and will serve two-thirds of that period before being released on a licence to serve the remainder in the community.
He will be a registered sex offender for the rest of his life.
The judge said he was conscious of the fact that the attack took place three years ago and described the delay as “inexcusable”. He said issues with disclosure of evidence had led to two previous trials collapsing and he would require a senior officer in the case to appear before him to explain what had happened.