The westbound truck flipped in the exit lanes to Queens Boulevard just after 12 a.m. Tuesday.
The driver of the flatbed truck may have slid on black ice.
The FDNY says the truck rolled after it hit a Jersey barrier separating the westbound lanes of the expressway from the Queens Boulevard off-ramp.
The truck was carrying 294 20-pound propane cylinders, which went up in a fireball.
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Firefighters spent hours putting out the flames and cleaning up the propane tanks. The fire went to two alarms before it was declared under control.
The driver refused medical treatment at the scene. No other injuries were reported.
All lanes of the expressway reopened just before the start of the morning commute.
A car and a postal truck were also damaged in the fire.
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