Indiana Code 35-43-2-2 states:
(c) A person has been denied entry under subsection (b)(1) when the person has been denied entry by means of:
(1) personal communication, oral or written;
(2) posting or exhibiting a notice at the main entrance in a manner that is either prescribed by law or likely to come to the attention of the public;
(3) a hearing authority or court order under IC 32‑30‑6, IC 32‑30‑7, IC 32‑30‑8, IC 36‑7‑9, or IC 36‑7‑36; or
(4) posting the property by placing identifying purple marks on trees or posts around the area where entry is denied.
Should this be taken to mean that a physical barrier (with out signage) does not deny entry?
Also as a second question how does no trespass signage affect delivery people, such as USPS, etc.