What is the name of your state? FL/CA
Okay, I've always believed the following to be true, if you are driving a motor vehicle on private property and you "yield" to any traffic that has the right of way, not stopping at a posted stop sign on private property is a non-issue.
For example, I'm in the Walmart parking lot and driving safely down a row of parking spaces and come to a posted stop sign. Having already recognized that there are no cars coming in either direction, I do NOT stop for the nuisance sign and continue through. Can a police officer pull me over for failing to stop at such a sign when it does not occur on public/state/government property? Or can they pull me over and site me for "failure to stop" at a stop sign?