Question juridique clé
Whether the planned access of the appellant's building plot through Sonnenbergstrasse is legally sufficient or whether a new connection to Sonnhaldestrasse must be ordered.
Solution extraite
The existing access under the binding quarter plan is sufficient; a second road connection is not required.
Motifs extraits
The authorities have broad planning discretion. The quarter plan's one-sided access avoids over-accessing the residential area, and the longer route does not make the access unlawful under planning law or the precautionary environmental principle.