Try change in sys from:

[warning]
is_spoken=1
;speedcam_warning=1
;speedcam_enabled=1
enable_speedcam_updates=1
say_camera_distance=1

on:

[warning]
is_spoken=1
speedcam_warning=1
speedcam_enabled=1
enable_speedcam_updates=1
say_camera_distance=1