The trunk road 778 or RN 778 was a trunk road French connecting Saint-Brieuc to Meucon. Following the reform of 1972, the section of Saint-Brieuc to Loudéac was initially renumbered RN 168 before being displaced in RD 790 between Saint-Brieuc and Plaintel and in RD 700 between Plaintel and Loudéac and that of Loudéac to Meucon was displaced in RD 778 .
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