You can clone with
When placement is "line" in TextSymbolizer and there are more texts on one line to be rendered, the texts can melt together and make the map confusing. It should be possible to set blank space at the end of the text, where no other text will be rendered.
See the image: text labels for cycleways "A2", "A1" and "2" are too close together, that it seems like cycleways "A22", "2A2", "2A1"...
[springmeyer] have you tried the 'spacing' parameter?
[Petr Dlouhy] Yes, the symbolizer element looks like:
The problem is, that the text originates from two (or more) DB lines and the text is placed in non-overlaping position by Mapnik.