Police are investigating the case of an articulated-bus driver who swerved across four lanes at a busy traffic junction and crashed into a stationary goods van.

Two people were injured in the freak accident, which happened on the afternoon of Jan 17 between Yishun Avenues 1 and 2, and was captured by a car videocam.

The clip shows that the goods van had come to a stop in the extreme right lane of the junction, waiting to turn. A minute later, an off-service SMRT articulated bus in the extreme left lane on the same five-lane road swerved sharply, somehow missing several moving vehicles before crashing into the van and traffic lights.

It also hit a truck waiting alongside the van. The impact sent the van careering up the centre median and almost into the path of traffic on the opposite side. The bus appeared to brush against a road kerb on the left before swerving on an apparently wet surface.

Police said the incident happened at 4.07pm, and a man and a woman - both 48 - were taken to Khoo Teck Puat Hospital nearby. Sources said they were discharged after receiving outpatient treatment. Police added that the bus driver is a 51-year-old Singaporean man and is helping with investigations.

SMRT spokesman Patrick Nathan said: "We apologise for the incident. The bus captain has been taken off driving duties. We have reached out to the injured and will continue to provide assistance."

He would not say how the accident happened.