A taxi driver locked the doors and drove her molester to the nearest police station.
Malaysian storekeeper Vikneswaran Veera Muthu, 20, was with a friend and the taxi was on the PIE when he leaned forward and grabbed the driver's breast.
Vikneswaran was jailed four months last week.
Taxi driver Ling Ah Yen was punched twice in the face after running over hawker Koh Seng Hong's chihuahua.
Mr Ling sustained multiple head injuries from the assault.
Koh was sentenced to eight months' jail last week.