Jamie Slater, 33, of Port Talbot, was sentenced to three and a half years at
Cardiff Crown Court for misconduct while in public office.
He contacted the women after stopping them and offered to let them off if
they had sex with him.
Slater was dismissed from South Wales Police in December.
The court heard how the South Wales Police officer used the police national
computer to access personal data on his victims.
The married father-of-two stopped six women for minor motoring offences and
requested their mobile phone numbers.
He later sent the women drivers text messages asking them to meet him for
sex. The court heard Slater harassed women who refused to meet him.
Peter Davies, prosecuting, said all Slater's victims had felt powerless to
complain because he was a police officer in uniform.