The Route 4 crash occurred when a southbound driver, Maynard Palmer, 61, of Gaithersburg, Md., crossed the yellow line in a rented black Mercury sedan and struck a Washington County Department of Public Works dump truck, the State Police said.The Mercury spun and struck a northbound Toyota Camry in front of Adirondack Natural Stone Co., police said.Palmer was flown to Albany Medical Center with serious head injuries and was listed in critical condition as of Friday.He had been visiting a relative in Vermont and was driving to Albany International Airport when the crash took place.The driver of the dump truck, Edward McCullen, 33, of Granville, and the operator of the Toyota, David Koran, of Ballston Lake, were taken to Glens Falls Hospital with non-life-threatening injuries, police said.Neither man was in the hospital’s public directory last week.Koran said he suffered deep contusions to his legs, arms and shoulder.His hands smashed into the dashboard as a result of the impact of the crash, he said."That caused a piece of the dashboard to go through my finger into the bone," he wrote."I had my seatbelt on but the impact bruised the shape of my seatbelt across my chest, but it saved my life."Police could not provide an update on the investigation into the crash when contacted Thursday night.They previously said it was not yet known what caused Palmer to cross the yellow line.