Good morning. Approaching Wilkes-Barre PA. I-476 S. red light = diff lock.

On a "twin screw" tractor, the differential lock is a God send in the snow. 

Never engage or disengage the lock if  your wheels are spinning and
you're not making traction.. 

Bad things happen.  Lots of banging and breaking of metal parts.

Be safe. Be kind....be cool. 

Later.

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