
Shah Alam police chief Iqbal Ibrahim said they received a call at about 3.30am regarding the incident, involving three Indian nationals and a Bangladeshi, aged between 24 and 29.
He said a preliminary investigation revealed that a man in his 20s lost control of his vehicle, which collided with water-filled barriers and a divider.
“At the time, maintenance work was going on in the area, resulting in the deaths of three of the workers. Another suffered minor injuries,” he said in a statement.
The driver was detained to assist in the investigation under Section 41(1) of the Road Transport Act 1987 for reckless driving.