Yes, home security signs are able to deter intrusions in New Haven
Many studies indicate that security signs work when attempting to deter an intrusion. The reasoning is that the thief will discover the display and instantly determine that your residence is way too risky. Ultimately, why stress over cameras and sensors when they can pivot to a less protected home down the road?
However, the same studies note that a visible display ranks fairly low as a burglary deterrent. A smartly positioned sign mainly dissuades amateur thieves, but seasoned criminals might want to find the extent of security that is actually defending your property prior to looking the other way. Other devices, like cameras, have greater success at preventing an intrusion.