The Third Track project is expected to close seven remaining grade crossings on the Main Line, namely those in Westbury, Mineola, and New Hyde Park. The first two crossings that underwent elimination would be Urban Avenue in Westbury and Covert Avenue in New Hyde Park. Construction to eliminate began from February–April 2019 with the closures of both roads. On the weekend of July 20–21, 2019, the trestle that will carry the three tracks was installed at Urban Avenue. After construction of retaining walls, pedestrian walkway, and the repaving of the road, Urban Avenue was officially reopened on September 5, 2019. Covert Avenue underwent the installation of a three-track trestle on the weekend of August 24–25 and reopened on October 12th, 2019. New Hyde Park underwent the installation of a three-track trestle on the weekend of July 11-12, 2020, and reopened in August 2020. By mid-2021, Main Street in Mineola, the pedestrian crossing at Mineola's station, and 12th Street in New Hyde Park will be permanently closed to pedestrian and vehicular traffic, while Willis Avenue in Mineola and School Street in Westbury will receive trestles, with the roads crossing underneath. From May 2020-November 2020 School Street underwent elimination and reopened less than 2 years after a violent accident involving a pick-up and two trains. On October 24th, 2020 New Hyde Park officially was grade-separated when 12th Street was closed permanently. As of late-2020, the only grade crossings in between Hicksville and Floral Park are located in Mineola. In November-2020, Willis Avenue's elimination project began that will see both its Main Line and Oyster Bay Branch crossings eliminated with the road going underneath the tracks. Main Street and the pedestrian crossing will be removed shortly afterwards. After the Third Track Project is completed there will be no grade crossings from Hicksville Westward, noise from horns will be reduced to the benefit of residents along the tracks, and carbon emissions from idling vehicles will be eliminated.