within the energy industry, approximately 4 percent of crude oil and petroleum products were shipped by truck in 2012. these shipments are handled by oil and gas logistics firms, which are midstream service providers that also handle transport by pipeline, rail, and barge. dominant companies in this space include aux sable, bridger group, dcp midstream, enbridge energy partners, enterprise products partners, genesis energy, gibson energy, inergy midstream, kinder morgan energy partners, oneok partners, sunoco logistics, targa midstream services, transcanada, and williams companies.