Which sign gives a driver the right-of-way over oncoming vehicles?

Explanation

Priority over oncoming vehicles is given by the square blue sign 2.7 "Priority over oncoming traffic", which marks a narrow section of road. The round sign 2.6 does the opposite and requires you to give way to vehicles approaching from the other side, while 2.1 "Main road" gives priority at unregulated intersections (Rules, signs 2.6 and 2.7).