Hi Gerd,

The optimization of roads is the most
complex part, that's why I've started with that. Now I am working on
shapes. I hope in the end I'll have a few algos which are fast enough to
reduce all errors which are caused by rounding to map units, no matter
whether lines are routable ways or not.
As long as you use resolution 23 for level 0 you have to live with big
rounding errors.

I will switch from resolution 23 to 24 to try make improvements and also use --route option.

Thank you for your help.

mira