What does "hazard perception CGI" mean? CGI comes from Computer-Generated Imagery. CGI clips replaced the old filmed hazard clips in the hazard perception part of the theory test on 13 Jan 2015. The reason why they changed filmed clips to CGI clips was that the image quality wasn’t clear enough.
Differences between old and new hazard perception CGI clips
Here you can see a picture where on the right is an updated hazard perception CGI clip.
These new CGI clips looks clearer than the old ones. Even the clips are now CGI, there are no other changes in the test.
Watch this introduction, and you are more likely to spot the developing hazards: