check if you have those lines into your sys.txt

[warning]
speedcam_warning=1
speedcam_max_lookahead=1000 ;Ne pas voir trop de radars sur la ligne d'horizon
overspeed_sound=0
say_camera_distance=1
say_camera_speed_limit=1
;speedcam_maxdistance_from_road=15
speedcam_maxdistance_from_road=10
speedcam_enabled=1
is_spoken=1