State Police say a semi-truck was cut off by an unknown box truck on Friday and that led to the fiery rollover crash that snarled traffic for hours. State Police say the driver reported to Troopers that the other vehicle "unsafely merged” onto the highway from the Exit 5 westbound on-ramp. The 28-year old driver tried to brake, lost control and swerved toward the center median, hitting the barrier. After the larger truck rolled, it was leaking diesel fuel. The truck blocked all three lanes of the highway and caught fire. The driver sustained minor injuries.