but I am wondering, whether when the kononnya "to reduce floodwaters" tunnel was first proposed, did they memang
a) intend to build a flood outlet, and since most days during the year the tunnel would be dry, therefore part of the tunnel would be designed for traffic.
b) intend to build a toll road right in the center of the city, but justified it's existence by giving it a "reduce the floodwaters" function.
as for the chicken/egg. which came first, Lulu takes the biblical basis that on the 5th day, God created the birds, and blessed them and said, "Be fruitful and increase in number and fill the water in the seas, and let the birds increase on the earth." Genesis 1
so, the chicken came first.