Vagcom while driving: Is it safe?

Hi there,
What happens if you read the measurement blocks using a device like VAG-COM while driving?
Could this potentially become dangerous?
I mean that the engine control unit might be resetting or crashing.
Strictly speaking, does the processor need to simultaneously send data via the CAN bus to the diagnostic tool during normal operation?
or at the very least, it must have simultaneous or time-delayed access to the data from the measurement blocks.
I mean a crash in the sense of, for example, due to an excessively large amount of data.
'My idea is to use an Atmel microprocessor and a small display connected to it to continuously read the sensor data during the ride.'
so that you have a very strong multi-factor authentication (MFA).
While it may not be possible to read data from multiple control units simultaneously, you can still access several sets of measurement values.
What's the idea?
greetings

If you pay attention to the street while doing it, reading the data is usually straightforward.
Seriously, that's exactly what the diagnostic interface is for; I've never had any problems with it.

Hi,
The worst thing that can happen is if no more data arrives.
The diagnostic interface has a significantly lower priority than the main program itself.
Electrically, the interface operates with on-board voltage levels.
Therefore, nothing can happen.

Best regards, Rudi.

hi,
What about the K-line and the CAN bus?
The K-line is connected and runs in parallel to all control units.
If the initialization process starts and the correct sequence of bits is received, then the addressed control unit will send a response.
That means that only one control unit is active on the K-line at any given time.
So, does the K-line have anything to do with the CAN bus?
Am I understanding this correctly?
What happens if you tap into the CAN bus?
So, a CAN bus controller and a processor?
Then, one should theoretically be able to communicate with all connected control units via the CAN bus simultaneously.
greetings