As of 2018, there are 440 kilometres of national roads, 408 kilometres of departmental road, and 1,311 kilometres of municipal roads in French Guiana. There is no motorway.
RN1 connects Cayenne with Saint-Laurent-du-Maroni in the west. RN2 connects Cayenne with Saint-Georges in the east. . RN1 goes to Suriname , RN2 goes to Brazil.
Following a treaty between France and Brazil signed in July 2005, the Oyapock River Bridge over the Oyapock River was built and completed in 2011, becoming the first land crossing ever between French Guiana and the rest of the world (there is a ferry crossing to Albina, Suriname). The bridge was officially opened on 18 March 2017, however the border post introduction on the Brazilian caused additional delays. As of 2020, it possible to drive uninterrupted from Cayenne to Macapá, the capital of the state of Amapá in Brazil.
RN3 to Dégrad des Cannes, the main harbour, and RN4 to Cayenne – Félix Eboué Airport became departmental routes in 2007, and merely retain the name.
There are plans to build a Route nationale from Saint-Laurent-du-Maroni to Maripasoula, however as of 2021, the road ends south of Apatou.
Departmental roads The most important departmental roads in French Guiana in 2007 are: Number Start End Comment RD1 Cayenne Remire-Montjoly Northern route RD2 Cayenne Remire-Montjoly Southern route RD5 Macouria (RN1) RN2 Via Montsinéry RD6 Matoury (RN2) Kaw Via Roura RD8 Iracoubo (RN1) Mana RD9 Mana Saint-Laurent-du-Maroni (RN1) Via Charvein RD10 Charvein (RD9) Acarouany RD11 Saint-Laurent-du-Maroni (RN1) Saint-Jean-du-Maroni Continues to Apatou RD16 Kourou Sinnamary Old route via Guiana Space Centre. RN1 is the main road. RD16 is closed during launches. RD21 Sinnamary (RN1) Saint-Élie Road ends at Petit-Saut Dam, and a 45-minute ferry is needed to Piste de Saint-Elie near Saint-Nazaire. RD22 Mana Awala-Yalimapo RD24 Remire-Montjoly Matoury (RN2) RD50 Régina (RN2) Cacao RN3 Cayenne (RN1) Dégrad des Cannes Downgraded to departmental road RN4 Sainte-Rose-de-Lima (RN2) Cayenne – Félix Eboué Airport Downgraded to departmental road
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