Witnesses reported that many Malaysian registered buses were refusing to continue their journey into Singapore at Woodlands. The "strike" by the bus drivers caused heavy traffic congestion at the Checkpoint.
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The Land Transport Authority said on its Twitter account at 8.13am that bus services 160, 170 170X and 950 were not travelling to Johor Baru (JB) due to impeded traffic flow at the checkpoint.
It said later at 10.11am that services services 160, 170, 170X and 950 have resumed normal operations into JB.