Tehran Shomal Freeway - Lot D2 Client: Tehran Shomal Freeway Company \ Client consultant: Sazbon Consulting Engineering Company Status In Progress Tehran Shomal Freeway - Lot D2 Geography Location Description The project involves construction of a 3.1 km mountainous highway and a 4.6 km mountainous replacement road including rock excavation, 12 bridges, protection works, 8 highway tunnels, retaining walls, galleries, etc.