The project to build a new Nam Dinh - Lac Quan - coastal road is a key project in Nam Dinh with a total investment of about 6,400 billion VND. The project passes through 5 districts: Nam Truc, Truc Ninh, Hai Hau, Xuan Truong and Giao Thuy, with a total length of 24.66km; including 3 large bridges.
The National Highway 21B overpass (also known as the Chau Thanh River overpass, located in Nam Cuong and Hong Quang communes, Nam Truc district) is one of the bridges at the first intersection of the project to invest in the construction of the new Nam Dinh - Lac Quan - coastal road. The bridge consists of two cars, each car is 17m wide, the distance between the two cars is 32.7m.

According to information from the Nam Dinh Provincial Construction Investment Project Management Board, the main structure of the National Highway 21B overpass has been completed, 12/12 pillars, 4/4 abutments, 14/14 spans and railings have been installed.
Also a large bridge of the investment project to build the new Nam Dinh - Lac Quan - coastal road, the new single Lac Quan bridge is 17m wide on the right side of the old bridge (to the downstream of the Ninh Co river). The bridge connects Truc Ninh district with Xuan Truong district, with a total length of 508.8m.
Currently, the main structure and approach road of the new Lac Quan bridge and the M2 abutment bridge have been completed.


A large bridge is located near the end of the route, the So River overpass. This is a bridge made of two units, each unit is 17m wide, the distance between the two units' hearts is 23m, the distance between the two edges of the railing of the two units is 6m. The bridge length is calculated at the end of the bridge abutment of 539.5m.
Mr. Dong Minh Quy - technical officer for the construction of package 3 of the new Nam Dinh - Lac Quan - coastal road construction project said that the So River overpass has completed 75% of the volume. Currently, 16/26 spans have been constructed, the structure of the upper and lower sections of the bridge is in the process of completion. In the coming time, the unit will mobilize workers and machinery to work overtime, determined to complete the bridge before June 30.
In addition to the above 3 bridges, the entire new Nam Dinh - Lac Quan - coastal road will have 7 more small bridges.