Usage Note
Ralentir is a second-group verb used both transitively (ralentir la voiture) and intransitively (la voiture ralentit). The noun ralentissement means 'slowdown' or 'traffic jam' in common usage. Au ralenti means 'in slow motion' or 'at a low pace'.
Examples
"Il faut ralentir dans cette zone."
Natural Translation
You must slow down in this zone.

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