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UPDATE: The southbound lanes on the Lake Pontchartrain Causeway are now open following a crash around noon today. Previously reported: METAIRIE, La. (WGNO) – The Causeway Police are investigating a major accident that has shut down both southbound lanes. Investigators say that four vehicles, including an 18-wheeler, were involved in the crash about 3 miles from the south shore. No injuries have been reported, but police say that the southbond lanes could be closed for up to two hours while the accident is cleared.