Three male Indian contract workers were killed and a Bangladeshi worker was injured when a car ploughed into them on the North Klang Valley Expressway (NKVE) at about 3.30am on Saturday (July 13).br br Shah ALAM OCPD Asst Comm Mohd Iqbal Ibrahim said the the driver, a man in his 20s, has been detained for further investigation and has undergone blood and urine tests to check for alcohol content.