The number four is avoided. The cardinal directions are not avoided: dong, nan, xi, bei; east, south, west, north. Beijing = North capital
The also use the inter cardinal directions NE, SE, SW, NW; they though reverse the words EN, ES, WS, WN: dongbei, dongnan, etc. Hmmm... maybe by adding these four directions, they have eight directions which is "lucky".
City and street names often include the direction prefix appendage.
