Lewis & Short

raedārĭus (rēdārĭus), i, adj. [raeda], of or belonging to a four-wheeled carriage: mulae, Varr. R. R. 3, 17, 7.
Hence, subst.: raedārĭus, i, m.

    1. 1. A coachman, the driver of a ræda: raedarium occidunt, Cic. Mil. 10, 29.
    2. 2. A wagon-builder, coachmaker, Capitol. Max. et Balb. 5, § 1.