modular weight systems for improving tire traction of automobiles on road surfaces affected by inclement weather are disclosed . the modular weight systems include a plurality of tiles that are configured to releasably mate to one another , and to fit within the cargo space of a vehicle without significantly reducing utility or becoming dislodged during movement . the tiles generally weigh between twenty and two - hundred pounds each , and they may be filled or doped with heavy filler materials , such as sand , stone or shot .