It’s true that security signs are able to deter intrusions in St. Petersburg
Many studies indicate that security signs are effective when looking at ways to deter an intrusion. The logical explanation is that the prowler will notice the display and quickly decide that your residence is a poor choice to target. After all, why stress over cameras and motion detectors when they can pivot to a less protected home somewhere else?
With that being said, the same research indicates that signage isn’t the most intimidating burglary deterrent. A wisely situated sign mostly dissuades amateur thieves, but veteran thieves will want to see how much security is truly shielding your property before moving on. Other devices, like cameras, do a much better job keeping an intruder away.