Question: The N6 or National Highway 6 is a national highway in Ghana that begins at the Nsawam road junction off which national highway in Ghana that begins at the border with Ivory Coast at Elubo and runs through Sekondi-Takoradi, Cape Coast, Winneba, Accra and Tema to the border with Togo at Aflao, and is the main highway along the coast of the country, with a total distance of 540 kilometers (335.5 miles)?

Context paragraphs:
National Highway 6 (Djibouti): National Highway 6 is a national highway in southwestern Djibouti.  The highway begins at , at a junction with National Highway 1 near Dikhil.  It passes through the town of As Eyla and ends at the village of Kouta Bouyya ( ).

Western Region (Ghana): The Western Region is located in south Ghana, spreads from the Ivory Coast border in the west to the Central region in the east, includes the capital and large twin city of Sekondi-Takoradi on the coast, coastal Axim, and a hilly inland area including Elubo.  It includes Ghana's southernmost location, Cape Three Points, where crude oil was discovered in commercial quantities in June 2007.  The Western Region enjoys a long coastline that stretches from South Ghana's border with Ivory Coast to the Western region's boundary with the Central Region on the east.

National Highway 26 (India): National Highway 26 (NH 26), (previously National Highway 43), is a National Highway in India, that connects Raipur in Chhattisgarh and passes through Odisha to connect with Natavalasa in Vizianagaram district of Andhra Pradesh.  It connects National Highway 5 and National Highway 6 and transverses the Eastern Ghats.

Route IR1: The IR1 or Inter-Regional Highway 1 is a highway in Ghana that begins at Mankessim in the Central Region and runs through Agona Swedru and Nsawam to Aburi.  It runs parallel to the N1 between the Central and Eastern regions, and has a total distance of 142 kilometers (88.23 miles).  The route runs through the Central, Greater Accra and Eastern regions of Ghana.

N6 road (Ghana): The N6 or National Highway 6 is a national highway in Ghana that begins at the Nsawam road junction off the N1 in Accra and runs through Nsawam, Nkawkaw, and Ejisu to Kumasi, where it meets the N4.  At Kumasi, the N6 intersects with the N10, R52, R108, and IR5.

N2 road (Ghana): The N2 or National Highway 2 is a national highway in Ghana that begins at the Tema Motorway roundabout in Tema and runs through Hohoe, Nkwanta, Yendi, and Bawku to the border with Burkina Faso at Kulungugu.  It is the main north-south highway in the eastern ccorridor of the country, with a total distance of 640 kilometers (397.68 miles).  The route runs through the Greater Accra, Eastern, Volta, Northern and Upper East regions of Ghana.

N3 road (Ghana): The N3 or National Highway 3 is a national highway in Ghana that begins at Kpong and runs west through Oterkpalu to Koforidua.  It is a link between the N2 and N4 in the Eastern region of the country, with a total distance of 40 kilometers (25 miles).

National Highway 1 (Djibouti): National Highway 1 is a major national highway of Djibouti.  It connects the suburbs of Djibouti City to Yoboki and the Ethiopian border near Galafi, where it becomes Ethiopia's National Highway 18.  The highway begins at a roundabout in Djibouti City at , near Colege De Fukuzawa, where it connects with National Highway 2 and National Highway 3.  National Highway 1 is 255 km (159 mi) in length and passes through the regions of Djibouti Region, Arta Region, Ali Sabieh Region and Dikhil Region.

N4 road (Ghana): The N4 or National Highway 4 is a national highway in Ghana that begins at the Tetteh Quarshie Interchange in Accra and runs through Adenta, Koforidua, and Asokore to join the N6, which continues on to Kumasi.  It serves as an alternate route from Accra to Kumasi, with a total distance of 110 kilometers (68 miles).  The route runs through the Greater Accra and Eastern regions of Ghana.

N1 road (Ghana): The N1 or National Highway 1 is a national highway in Ghana that begins at the border with Ivory Coast at Elubo and runs through Sekondi-Takoradi, Cape Coast, Winneba, Accra and Tema to the border with Togo at Aflao.  It is the main highway along the coast of the country, with a total distance of 540 kilometers (335.5 miles).  The route runs through the Western, Central, Greater Accra and Volta regions of Ghana.

Supporting paragraphs: N6 road (Ghana) N1 road (Ghana)
Answer: N1