Hello buddy
Responding directly to your question - yes, there is such a possibility!

Unfortunately this is not easy. For skins that have additional mod speedcam_sond_off - it's simple - select the appropriate menu option and the case is settled.

But you have placed the question somewhat perversely - Can you indicate the passing speedcamera message does not sound - just voice, and in addition have the possibility of no use Skin!
He made some tests today and found out although not directly!

Module [Speedcam Cat xx] in its configuration provides the ability to set the message repeated at a predetermined distance from speedcam'a.
This is true - so using this property I set these options as follows:
/ Under the proposed amendment to the provisions of Section SpeedCEM: CAT xx and WARNING:
.................................................. ....................................
[warning]
speedlimit_warning_voice = 1
speedlimit_warning_visual = 1
speedcam_visualtype = 2
speedcam_soundtype = 2
speedcam_warning = 1
warn_distances = "100: 900.70: 700.0: 400"

; S P E E D C A M - C A T: xx; Warning lights at the 400 m. Before the point !!
[speedcam_category: 0]
approach_beep_distances = 200; operating range of the signal "beep"
approach_beep_spoken_type = sound; = None / sound / speech (TTS only)
approach_beep_sound = "Fixed_Camera"; It if approach_beep_spoken_type = sound

approach_beep_speech = "Warning!" ; It if approach_beep_spoken_type = speech

activated_spoken_type = speech; = None / sound / speech (TTS only)
activated_speech = "Speed ​​camera ahead." ; (= speech)
activated_sound = "Fixed_Camera"
activated_min_speech_repeat_delay = 0; , = - 1
; overspeed signal ...
overspeed_spoken_type = sound; = None / sound / speech (TTS only)
overspeed_sound = "! alert2"; It if overspeed_spoken_type = sound
overspeed_speech = "Over Speed"; It if overspeed_spoken_type = speech

skin_first_sound_type = speech
skin_first_sound = "Warning!"
skin_speed_sound_delay = 120
skin_repeat_sound = "Warning"
skin_repeat_distance = 10
skin_off_sound = "speedcam_off"
use_road_speedlimit = 1
min_frc = -1
.................................................. .....................................
Principle of operation:
In the distance indicated by the line warn_distances activates warning!
For this Cat xx 200 meters from the speedcam will be the speaker first message "beep" - there will be a message "Warning + Speed ​​Camera Ahead" repeated.
At a distance of 10 m from the speedcam WARNING message appears.
If you will be using Skin - then you have a line that activates the sound speedcam_off

And most importantly - if you want to have a message about the end - it change the content of "Warning" on such .: "speedcam END!"
I tried it and it works - you can try to change the parameter skin_repeat_distance = 10 - from 10 to 2 in order to be closer to the speedcam
But remember - It is justified only if it is one-sided speedcam !!!
If it is a type of two-sided passing of the scope of action should be on.
Let me know how it goes - because it is still possible to use section section start and end - but that's another story.
Regards wojpen