What sign is used for "dual carriageway" signs?

• A

  Sea 1 and 2

• B

  Sea 1 and 3

• C

  Sea 2 and 3

• D

  Sea 2

  According to the National Technical Regulation on Road Signs QCVN 41:2019, the "dual road" sign (symbol W.235) is used to notify drivers that they are about to drive to a two-way road with a median strip in the middle.
  Sign W.235 is installed at the beginning of the road section and in a convenient location for drivers to easily observe. This is to ensure that drivers participating in traffic on the road can promptly control their vehicles in accordance with regulations.
  Identification features: equilateral triangle, red border, yellow background, black drawing of 2 arrows in opposite directions and a dividing line above.