Some of the crashes that happen are very sudden and intense. Especially as the terrain of the track that they run out is not as spaced out as it is in other motorsports, so the violence is shown and feels way more intense and sometimes even more violent.
The violence of this motorsport is comparable to Formula 1, however, unlike Formula 1, the violence shown in here is sometimes much more extreme than shown in F1.
Cars often crash on top of each other, do a barrel roll, 360 spins, all pretty violent, but not that violent stuff that you wouldn't be used to seeing. However, in some ocassions, cars can crash so hard that they start going on fire or even breaking into pieces very violently, leaving the driver into a scary position.
It is also to be said that the two most violent motorsports in the world are: Formula 1 and Nascar, however, due to Nascar being recalled as the toughet motorsport in existance, the violence in this sport is much more sudden, more intense that you fear it's waiting time and when it happens... well, be prepared for something anxious and intense.