Route de la Trace
The Route de la Trace is a national road , also called Rn 3 , in the overseas department of Martinique . It is 29 kilometers long and leads from Fort-de-France to Le Morne-Rouge via L'Ajoupa-Bouillon . At Le Morne-Rouge it leads through a tunnel, the Tunnel de Deux Choux .
This road is not to be confused with the Route nationale 3 on the French mainland .