To know how to make animated textures, check
this step of the Silent1Unknown's car making tutorial.
About make custom traffic lights objects as PKG objects for your city with the blinking orange light, you can well edit the imported in-game object like in the picture, just assing the animated texture instead of the default red glow, move and alight the glows to the orange light and export it as Building type .pkg file using the Maxoff's ZModeler PKG Filter. Make night copies of the orange glow textures.
The final result will be nice, maybe with some transparencies issues with the glowings; then, it can't be breaken because it's not a prop object.