No one was injured in the accident, Suffolk police said.
Lukas was driving a 1996 Ford pickup eastbound on South Country Road at 3:35 p.m., police said, when he sideswiped the school bus, which was stopped and preparing to make a left turn onto Montauk Highway. In addition to the driver, there were 55 passengers on the bus - children 5 to 9 years old, police said.
A witness followed the truck when it left the crash scene, police said, and called 911 with its location on Bellhaven Road in Brookhaven. Responding officers took Lukas into custody, police said.