"Do not disturb" - silence for safety
There are apps that block or mute messages and calls that interrupt the driver. Though, One must be aware, remember and start these apps before every ride. I recommend Adding a "silence" option in waze setting. The option should allow to block calls,messages, FB etc. individually or all at once.

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Anonymous commented
Yes this will be very useful. Just Recently just about 100m to make a turn, someone calls me and almost make me drive in different path... (there are 2 path to the left.)
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hey now #deleteJosh commented
Tasker
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Eduardo commented
Additionally, Waze could send an automatic message / or voice message to whom called.
Example: "I'm driving now, you can reach me at AM0:00..."
Or a customized user voice message. (like an old answering machine) :D -
Michal commented
With all the accident do to telephone use, I think this a wonderful and absolutely needed idea!