Hello, just got in igo primo (sys.txt) under warning some rules of which I do not understand what these are and what they do, see below from (sys.txt)

[warning]
speedcam_continuous_approach_beep_when_tonal = 1
speedcam_maxdistance_from_road = 20 speedcam_max_angle = 60
speedcam_max_lookahead = 900

does anyone here know more about?