Just seal off windows and doors.
Got money then do double layer window pane.

These panels are for echo reduction.

I'm thinking to get those insulation panels to stick on my wall to reduce the noise generate from nearby highway.

Checked with one seller on Lazada. Unfortunately, the reply was as follow:
Our products are mainly aimed at indoor noise. They are used in music rooms and meeting rooms to reduce sound transmission and improve sound quality. The effect of reducing outdoor noise is not obvious.

Tumpang tanya, what is the best solution to cope with constant sound from outside traffic, it is really bothering as I can hear the 'shhh shhh shaaa shaaa' sound all day even at late night

Tried closing up the windows but it doesn't really help. Also don't feel like closing the window as there will be no air circulation / natural ventilation.

Thanks