Udon Ratthaya Expressway
The Udon Ratthaya Expressway is a toll city highway in Bangkok , which is partly designed as an elevated road and continuously four lanes (two in each direction).
The Udon Ratthaya Expressway begins in the south as an extension of Section C of the Si Rat Expressway and runs north to the Outer Bangkok Ring Road . The total length is 32 km. This city motorway was opened in two sections on December 2, 1998 and November 1, 1999.