Why? Because when there's an accident, all cars passing by will slow down to look at the wreckage.
While on my way back today, there was a truck that flipped onto it's side.

And because of that, was caught in a jam for a while.
In your region, will there be a traffic jam when an accident happens?
BTW- I know I'm supposed to be working on my Malacca posts, but haven't found the