Port Talbot offers excellent inland transport links, with easy access to the M4, which is adjacent to the port estate, and direct access to the UK railway network. Port Talbot Tidal Harbour has the deepest berthing facilities within the Severn Estuary and is able to accommodate vessels of up to 180,000 dwt. While the harbour is utilised primarily by Corus for importing large quantities of iron ore and other raw materials, additional capacity exists for the future expansion of the harbour's cargo-handling capabilities. Port Talbot's inner docks offer general cargo berths for a variety of traffics including processed slag and timber and can also accommodate heavy lift ro-ro cargoes. Significant potential exists to develop other traffics.