The cabinet Tuesday approved a Transport Ministry plan to build nine more bridges across the Chao Phraya River in Bangkok and neighbouring provinces by 2021.
Deputy government spokesman Pakdiharn Himathongkham said the total cost of the bridges should be around 48.95 billion baht.
They are being built to help ease the flow of traffic across the river, which in the greater Bangkok area is set to rise to 4.5 million trips per day in 2021 from the current level of 2.7 million to 3 million trips each day.
Five of the bridges will be in Bangkok, two in Pathum Thani and one each in Nonthaburi and Samut Prakan provinces.
One of them, costing 9.1 billion baht, will be built in the Kiakkai area of Bangkok to serve the new parliament building.
A 10th bridge is also planned for the Sanam Bin Nam area of Nonthaburi province, but its construction will not start until some time between 2022 and 2031.
Separate plans for a new bridge in the Bang Krachao area of Samut Prakan, where traffic volumes are high, were shelved because of its status as a conservation area.