Anyone who has driven on DASH highway knows the road surface is very uneven, especially the elevated part over the housing residential areas

Was the contractor told to make it uneven on purpose so that you find it difficult to speed on the highway? Cos if you speed and crash into the side barriers at high speed, the vehicle would plunge down and kill many people living in the houses underneath?

If other highways can have road surface so smooth, why on DASH is so uneven road surface?