A woman was in serious condition after being struck Thursday night by a car on Day Boulevard in South Boston, State Police said. Police received a report of a pedestrian struck at about 6:30 p.m. on the road near I Street, said Lieutenant Daniel Richard, a State Police spokesman. The woman, whose identity was not released, was taken to Boston Medical Center. The driver remained at the scene, State Police said. Day Boulevard was closed in both directions following the accident, State Police said.Jennifer Smith can be reached at email@example.com.