An optical module for a motor vehicle including a first optical element including light guides and a projection optic arranged at a distance from the first optical element and having a longitudinal optical axis. The light guides are aligned in a series, perpendicular to the longitudinal optical axis and in a transverse direction, and they include first light guides and second light guides. The first light guides are arranged successively with respect to each other by being interposed between the second light guides, the first light guides each having a transverse dimension less than the equivalent transverse dimension of each of the second light guides. The first light guides are predominantly offset transversely with respect to the longitudinal optical axis.