Except the angle of the appearing car would suggest that it is turning, which would also suggest that it came from their right, relative to where they entered the intersection, and the car is too long not to be seen on the right side of the main car in the gif before passing onto the left side of the main car. honestly tho, i'd say it's shopped.
It's turning a little because it's avoiding to hit the other cars.
And no, it's not too long seeing simply because it's much further away when the car is first hidden than when it appears.
I have spent the past 20 minutes figuring this out and the only conclusion I can remotely come to is that the car was hidden behind the BMW then turned really sharply. Apart from that, I got nothing, most of the blood has gone from my brain.
Plus there is no evidence of the car through the BMWs windows plus you can clearly see that there is no car in front of the BMW at the lights. Like I said, most of the blood has drained from my brain, that's the best I could come up with.
at the beginning, you can see the headlights of the car coming for the opposite direction, then as the cars turn the first car blocks it from view where the cars turns some to avoid a crash once again blocked from view by the car that stops allowing the driver to slip past