Question: Hexham Bridge is a road bridge in England, that is the main access to the A69 road, which runs east-west across where?
Context: Viaducto Miguel Alemán is a crosstown freeway, opened in September 1950, that runs east-west across central Mexico City.  In the center of the road is a river encased in cement to control flooding.  Metro Viaducto is named after this road. Haydon Bridge is a village in Northumberland, England, with a population of about 2000, the civil parish(Haydon) being measured at 2,184 in the Census 2011.  Its most distinctive features are the two bridges crossing the River South Tyne; the picturesque original bridge for which the village was named (now restricted to pedestrian use) and a modern bridge which used to carry the A69 road.  A bypass was completed in 2009 and the A69 now bypasses the village to the south. The Green Bay Road Bridge is a Pratt pony truss bridge across the Manitowoc River in Manitowoc Rapids.  The 150 ft bridge was built in 1887 by the Wisconsin Bridge and Iron Company and was the second river crossing built at its location.  Originally a road bridge, the bridge is now used for a bicycle and walking trail; it is in good condition and is considered a historically significant example of a pony truss road bridge.  The bridge was added to the National Register of Historic Places on August 3, 1998. Hexham Bridge is a road bridge in Northumberland, England linking Hexham with the North Tyne valley.  It lies north of the town of Hexham and is the main access to the A69 bypass. Hexham Old Bridge was an 18th-century stone bridge across the River Tyne at Hexham, Northumberland, England, and was located about 1 mi upstream of the present Hexham Bridge. The A6079 is a road in Northumberland, northern England, that runs eight miles (13 km) from Hexham to the A68 road.  The road begins off the A69 road to the north of Hexham, before passing the villages of Acomb and Wall before meeting the B6318 road just to the south of Chollerford - unusually, traffic on the A6079 must give way to the traffic on the B6318, despite the fact that "A"-roads are more important than "B"-roads.  The A6079 continues through the village of Chollerton, and terminates at its junction with the A68 road to Edinburgh, nine miles (14 km) north-west of Corbridge. Quarff is a small village in the Shetland Islands in Scotland.  It is located on the main A970 road, 5 mi south of Shetland's only town, Lerwick.  The village is spread along a classic glacial valley that runs east-west across the island between high hills to north and south, with centres of population at Easter Quarff which is near the main road and the east coast, and Wester Quarff which is 1½ miles west and faces the Atlantic Ocean.  A narrow road runs along the valley between the two. Greenhead is a village in Northumberland, England.  The village is on the Military Road (B6318), about 17 mi from Chollerford, 3 mi from Haltwhistle and 9 mi from Brampton, Cumbria along the A69 road.  The A69 road bypasses the village, but until the 1980s all vehicular traffic passed through the village.  The village lies just outside the Northumberland National Park, close to Hadrian's Wall.  Just to the north of the village is the 12th century Thirlwall Castle, recently opened to the public.  Nearby villages include Upper Denton and Haltwhistle. Constantius Bridge is a modern concrete bridge across the River Tyne about 1 mi west of Hexham, Northumberland, England.  The bridge carries the A69 road over the River Tyne and forms part of the Hexham bypass. The A69 is a major northern trunk road in England, running east-west across the Pennines, through the counties of Tyne and Wear, Northumberland and Cumbria.  Originally the road started in Blaydon, but since the creation of the A1 Western Bypass around Newcastle upon Tyne, it now starts at Denton Burn a suburb of Newcastle upon Tyne.
Answer: the Pennines