The driver of the tractor-trailer involved in a four-vehicle crash that sent seven to the hospital on Friday, including one with potentially life-threatening injuries, is likely to be cited for a red-light violation, according to Durham Police. Deputy Chief Rene Kelley told Foster’s on Monday that “multiple witnesses” told police the driver of the 2007 Western Star tractor-trailer, identified as Eddie Watson, 59, of Barnstead, drove through the red light at the Route 4 and Madbury Road intersection. Watson was traveling east on Route 4 and struck a 2016 Jeep Wrangler traveling north on Madbury Road and a 2005 Toyota Corolla traveling south on Madbury Road. Also involved in the crash was a 2015 Chevrolet Traverse that was traveling west on Route 4. On Friday, State Police said the driver of the Jeep, Meredith Hamel, 47, of Barrington, was transported to Portsmouth Regional Hospital with “serious, potentially life-threatening injuries.” Kelley did not have an update on her condition on Monday. However, he did say the other people involved have been released from the hospital. That includes the Toyota driver Sotheada Ban, 53, of Somersworth, and the Chevrolet driver, Richard Bernier, 51, of Barrington and the four passengers in his vehicle. Kelley said the crash, which occurred around 7 a.m., remains under investigation and the State Police accident team is reconstructing the collision. The area was closed to traffic for about five hours to investigate the incident.