why did the LTA permits the use of cargo van with no windows.

[ykhuser]

knn..those cargo van with only 2 windows in front..no windows behind..these drivers how to check blind spots. some more most of them did not use additional blind spot mirror to assit them.
how the fuck did lta approve these van on the road?
10 years ago..i work as a van delivery..i was perplex by how they check blind spot