A tractor-trailer's driver was uninjured after it crashed into a guardrail Thursday morning.The Florida Highway Patrol said that the 45-year-old Ruskin man was driving the tractor-trailer south on I-75, north of SR-60, when it failed to negotiate a curve in the road.The vehicle then rotated, jackknifed and entered the center median before colliding with the guardrail. FHP said due to a fuel leak, several travel lanes are currently blocked, so drivers should expect delays.