Flash floods were reported in several areas causing traffic to slow down from the Cheras roundabout and 9th mile toll plaza to the Taman Billion roundabout at 6pm.
Traffic was also reportedly slow in the surrounding areas, from Bandar Tun Razak to Taman Connaught on the East West link.
On the MRR2, traffic is slow from Sri Petaling and Taman Connaught to Bandar Tasik Selatan and from Ukay Heights to Pandan Indah and Batu Caves.
On the PLUS highway, a crawl is reported from Kajang northbound to the Sungai Besi tolls. Many Twitter users have reported flooding as a possible cause of congestion.
Earlier in the day, a consignment of concrete segments fell on to Jalan Cheras at about 11am forcing vehicles to a crawl near the roundabout in Taman Billion.
MRT Corp said operations to clear the road of the concrete ended at about 1.30pm and all lanes leading to Taman Billion roundabout were reopened to all traffic.