TURNER — An Auburn woman was killed Wednesday afternoon when her motorcycle struck the side of a pickup truck on Route 4.

Police said 54-year-old Margaret Wing of 20 Gage Lane was killed instantly when her 2005 Harley Davidson motorcycle was struck by a pickup driven by John Robinson, 73, of Turner.

Wing was not wearing a helmet, according to a press release issued by the Maine State Police Thursday morning.

According to the release, the investigating officer, Trooper Ricci Cote, said speed and alcohol did not appear to be a factor in the accident.

State police were reconstructing the crash as part of their investigation into the fatal wreck, which occurred at about 3:30 p.m.

The crash took place as Robinson made a left hand turn in front of the motorcycle, at the intersection of Oakwood Drive, the release stated.

After the crash, the truck, a white pickup with a plow in front and a sander in back, came to a stop at the side of Route 4 in front of Oakwood Drive, a short road leading into a mobile home park. The motorcycle came to rest on the paved shoulder a few feet away.

The crash forced the closure of a stretch of Route 4 between the Chickadee Restaurant and the plaza that houses the Big Apple and Dunkin’ Donuts. Afternoon commuter traffic was rerouted around the scene, onto Fern Street to the south, Wood Street to the north.