Wondering on why it is always congested during rainy seasons? It is usually due to flash floods at main roads. One of the worst nightmares of the city dwellers is when their vehicles are inundated by flood water.
Due to flooding, it is equivalent to traffic gridlock where none of vehicles are able to move causing massive traffic jam along other adjacent roads.
For example, it was reported that several roads in Kuala Lumpur hit by floods after heavy down pour. Heavy rains causes several rivers such as Sungai Gombak and Sungai Bonus to overflow and causes flash flood at main roads.
May be it is time for the city to construct more storm sewer such as the Smart Tunnel to divert excess water during heavy down pour to designated storage areas.
Read related entry about Flash Flood and Traffic Jam.