Inland waterway classification regulated in Circular No. 46/TT-BGTVT dated 29/12/2016 includes 7 technical levels, namely: special level, level I, level II, level III, level IV, level V and level VI. When constructing, renovating or upgrading road bridges, railway bridges or other structures across the channel, the navigation clearance and depth of the channel must be complied with the waterway classification standard.