Snowbound cars are catching fire

From the Mpls/St. Paul StarTribune:

About a dozen cars caught fire in St. Paul during Sunday's storm, according to St. Paul Fire Marshal Steve Zaccard.

He said most of the fires probably started when drivers got stuck in the snow and began rocking their vehicles back and forth in an attempt to get free, overheating the transmission and causing engine fires...

 I've "rocked" a car before to get it unstuck; I never realized such maneuvers endangered the transmission.  You learn something every day.