Tahir Pass is a high mountain pass at an elevation of 2.496m (8,188ft) above the sea level, located in Ağrı Province, in Eastern Turkey.
The road to the summit is unpaved and very steep, with some narrow sections. During winter time the road was a nightmare for the truck drivers on the way to Iran. Avalanches, heavy snowfalls and landslides can occur anytime, being extremely dangerous due to frequent patches of ice. The road was almost impassable four months of the year. On the steep, ice-sheeted roads, trucks slide even when stationary and when it is too dangerous to brake, the only way to slow down is to run from drift to drift. The notorious unsurfaced road to the summit was a military road on the Old Silk Road, between Erzurum and Agri.
The pass is 25.2 km (15.65 miles) long. The road is perilous and involves a treacherous spell across Turkey’s hazardous Tahir mountains. Due its unique location and the climb in elevation over thousands of feet, and passing through remote areas, it is important when driving in these conditions to be prepared. The road is now bypassed by a paved modern highway called E80-D100.