signs too small

[yopaseopor]

20 pixels is really a bit too small for most as they become pretty much unrecognizable

[yopaseopor]

I have made some test with other traffic signs of other countries and 20 is a good size. I know it is not readable, but also you have to think this have to be less invasive in JOSM layers.
But if you want a bigger image you can modify the file when you have already installed the style and change all the icon-width:"20" ; for icon-width:"32" ;