You never work "backup" or "assist"?
Never any car in the area or such?
I never worked interstates either as a rule but when the "HIT tone or Other 
ISPERN  broadcast in the area I was assigned was received, I/we responded.
1982 Brooklyn/National City 3 armed kidnappers apprehended and 2 abductees 
retrieved and many others over the years.
The miracles of moderrn Communications, unless they purposely keep you guys 
in the dark as to what's going on around you which would seem to be a whole 
lot of liability to them
--- Maximus 3.01
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