The road from Tbilisi to the border is fine; after crossing the border you will come to a T junction in the highways. Locals refer to the road to the left as the "high" road, it passes very closely to the Azeri border and you can see military posts and trenches to your left as you ride. This road has two passes and you will come to mega tunnel, Lake Sven and then have 4 lane down to Yerevan.
If you turn to the right and take the lower road, it is shorter, but has some unlite tunnels, has one pass and I find it to be much slower as it is used by trucks more than the upper road.
From Yerevan to the Iran border there is currently construction in a few places, broken pavement and lots of potholes and a few gravel stretches which are to be paved.
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