Near Eindhoven a matrix sign lights up with a black background and a white '90'. A fellow student says: 'Black background, that's just the standard matrix style, ignore that colour.' What is correct?
The colleague is right: the background colour of a matrix sign has no meaning of its own
The black background is the 'start sign': it indicates that a new maximum speed begins here
Explanation
False — trap: detail dismissed as noise. **A black background on the matrix sign (A3) marks the start sign of a new maximum speed.** Book p.238.