Life's about to get a bit more frustrating for Google's international Google Maps teams. That's because regulators in Italy have mandated that Google take additional measures to warn local populaces when its Street View cars are out and about—and, more importantly, taking pictures of unsuspecting passersby and locations alike.

According to Italian newspaper La Stampa, Google will now have to ensure that its Street View cars are clearly and obviously marked—as if the giant cameras on top weren't enough of a giveaway.

The company will also have to publish in local papers and issue reports across the radio whenever and wherever it plans to use said cars to snap new images. A three-day warning is being demanded by regulators, hoping that it will be enough of an advanced notice for those in the path of the exact locations where Google's Street View cars will be operating.

"There has been strong alarm and also hostility in a lot of European countries against Google taking photos. We have received protests even from local administrations," said Privacy Authority President Francesco Pizzetti.

The move comes right in the wake of Google's big admission Friday that its Street View cars had unintentionally collected data from unsecured wireless networks during the performance of their street-snapping tasks.

In essence, Google used a piece of software called "gslite" and a packet-sniffing application called Kismet to supplement its cars' GPS systems. If GPS wasn't available or working for whatever reason, a Street View car could attempt to pinpoint its location by identifying available Wi-Fi signals to triangulate its position using a database of wireless access point locations.

"Triangulation is a lot harder than you'd think. This is because many things will block or reflect the signal. Therefore, as the car drives buy, it wants to get every single packet transmitted by the access-point in order to figure out its location," writes Errata Security's Robert Graham. "Curiously, with all that data, Google can probably also figure out the structure of the building, by finding things like support columns that obstruct the signal."

In Google's case, its Street View cars managed to pull in data fragments alongside the various packets collected by the software. And instead of automatically deleting this information, Google kept the miscellaneous data alongside the MAC address, network SSID, and signal strength deduced by its wireless sniffer.

"As soon as we became aware of this problem, we grounded our Street View cars and segregated the data on our network, which we then disconnected to make it inaccessible. We want to delete this data as soon as possible, and are currently reaching out to regulators in the relevant countries about how to quickly dispose of it," wrote Google's Alan Eustace, senior vice president of engineering and research, in a May blog post.