Your route to

From Karlsruhe /BAB A8:
Exit Pforzheim/Ost.
To Niefern-Öschelbronn from there to Wurmberg.

From Stuttgart /BAB A8:
Exit Heimsheim.
To Friolzheim from there to Wurmberg

New from October 2008 from Stuttgart / Karlsruhe /BAB A81:
Exit Pforzheim/Süd to Wurmberg from there to Neubärental.