Is it really possible to create a fake traffic jam on Google Maps?
According to ArsTechnica  and TheRegister , the german artist Simon Wecker realized a performance art piece, named "Google Maps Hacks", walking around the roads of Berlin pulling a small hand cart behind him.
Inside the cart were 99 smartphones connected to Google Maps for driving directions: the goal was fool the Google's systems into believing that there is a severe traffic jam in the area. Even when there is no traffic jam in reality.
However, looking at photos (and video) published by Wecker , I noticed something strange, for example:
First: Is this small cart able to contain 99 smartphones?
Then: are the screens bright enough to show what they have on the screen in full sun, and with shadows on their surface?
And finally: are the screens of these smartphones so bright that they appear extremely white while under daylight?
So, Is it a fake?
I discovered that also Paolo Attivissimo has the same doubts  regarding the photos published on Wecker's website.
In my opinion, the "artistic performance" may be technically real (GMaps' behaviour should be true, with a large number of devices): however, for "stage requirements" the photoshoot may have been performed using a set of fake phones. (Occam's razor?)