Hi there,
Yes you are right it is time to get back on topic.
I have a suggestion for Germany, more exactlier for the Elbtunnel Hamburg..
At the before mentioned channel from Sascha is a video where you can here a warning message from the police, distributed by loudspeakers within the tunnel. It says :
Attention, this is the police speaking, Keep clear of an alley in the middle of the lane for rescue vehicles
(in German language of course)
Link is here
https://youtu.be/sZMqQVx6yD0
Maybe you can place such a soundfile that might be played if there is an accident (road event) near the tunnel, or if not possible place it as soundfile (as ambient sound) which can be heared by driving through the tunnel. Maybe with a repeat of every 15 minutes or so. So that you hear it not everytime.
Would be a nice touch for reality..
Only if possible and with Sascha's permission.
Just a suggestion.
Regards
MG Mike