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The N4 road is the Trans-Gambia Highway extension in Senegal, which is the main connection between the Casamance area in the south and the capital Dakar.
The road runs north from Ziguinchor in Casamance to Bignona, crossing the Casamance River. It runs north-east to Bounkiling and then north to traverse the country of Gambia between Soma and Farafenni, crossing the Gambia River by ferry. After travelling north-west to Kaolack it joins the N1 road, which links to Dakar.
The building of a prestressed concrete bridge over the Gambia River has been discussed for many years. It would need to be nearly 1000 metres long with 500 metres long access roads through the riverside swamps.
An alternative (smaller) route is the N5 via Bignona and Banjul, crossing the Gambia river by ferry at Banjul and rejoining the N4 just south of Kaolack.