i don't use traversal... but can't you just use an httpexception?
http://readthedocs.org/docs/pyramid/en/1.0-branch/api/httpexceptions.html
class HTTPForbidden(detail=None, headers=None, comment=None,
body_template=None, **kw)
subclass of HTTPClientError
This indicates that the server understood the request, but is
refusing to fulfill it.
code: 403, title: Forbidden
from pyramid import httpexceptions
....
return httpexceptions.HTTPForbidden()
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