Experts tend to agree that as of now, the underpasses are not safe as they haven’t been constructed properly. Civil engineering expert MN Sreehari told BM, “When there is a design fault in them, they cannot be deemed safe. The fault needs to be rectified. The slope in underpasses is deep, leading to waterlogging and difficulty in draining the water. To maintain an adequate slope, extra length needs to be given on either side but that will ramp up costs. The ideal slope should be of 1:50 gradient.”