luko1208 wrote: ...
Both turns are marked with give-way signs, both vertical and horizontal.
No, they're not "both".
This is a multi-lane intersection and where the signs are placed is crucial.
And so, for people turning left from the national road 79 to the connector to S1, the sign is placed in front of the lane for the opposite direction and also in front of the road for people turning left from the connector to DK79.
For those turning left from the connector on DK79, the sign is in front of the main road for those coming from the left.
Thus, a person turning left from DK79 is obliged to give way to both vehicles from the opposite direction on DK79 and vehicles turning left from the connector from S1.
A person turning left from the S1 connector to DK79, after passing his A7 sign, has priority over those waiting for a left turn from DK79, because their A7 sign is in front of the road they are using.
Simple and obvious.
The right-hand rule applies only in the absence of other markings and signals, and your friend is right and understands the rules and road markings better.
If you prefer the logic why this is so, then the S1 road and its exits have priority over the entrance, because otherwise it would lead to traffic clogging - vehicles cannot exit because they must give way to those entering, and you cannot enter because exiting vehicles do not slow down places.