Yes, someone actually took the time to build this.
Not every day do you just happen to stumble upon something like this. No, it's not some supercar or other rare exotic. What this appears to be is a Russian-made contraption of some sort. For whatever reason (and likely not a good one), someone had the idea to build this rather narrow police car. Amazingly, some guy actually managed to fit inside of it. Thanks to Google Translate, these fine specimens apparently found the thing at random and decided to film it. Why it was built, we have absolutely no idea.
Our best guess is that it was placed there in order to deter drivers from speeding on the highway. Still, it's quite a random thing that evidently provides some with a few minutes of cheap entertainment.