Dive summary:

• A garbage truck driver in Springfield, Mass. was driving across a bridge when his truck began to act funny: lights and dashboard instruments would flicker on and off, smoke was starting to rise from the truck, and just as he stopped the vehicle, it burst into flames.
• Normally when trucks catch fire it is due to something improperly thrown away by a careless resident, this fire however was completely in the front of the cabin and started by an electrical or mechanical malfunction.
• The Springfield police say the bridge will be closed down for some time in order to tow the vehicle and make sure there were no fuel leaks that could start another fire.

From the article:

Leger said the older-model truck, owned by the City of Springfield, had just dumped a load of trash at the landfill facility at Bondi's Island in Agawam and was returning to Springfield.

Leger said the driver reported that while on the bridge, he started experiencing problems with the vehicle. Lights inside the truck and dashboard instruments started flashing on and off. The driver pulled over when he smelled smoke and had just stopped when it burst into flames, he said.

The Springfield Arson and Bomb Squad investigators determined the fire was caused by electrical or mechanical malfunction, Leger said. ...