OK that sounds like it, then. Your use of the word emergency threw me. It seems like they call it "the main" or something like that.
This inspired me to go listen to many of the DOT District 6 talkgroups and it was boring. I was trying to see if I could come up with a name for the 10 or so talkgroups I don't have a name for*. Sometimes they call each other by names like "Wabasha 5" and sometimes they go by numbers like "603". Does anyone know of a source that converts the numbers to a name?
* I believe all of these talkgroups are associated with MN DOT District 6 (largely because they all share the same multigroup - 20067):
20050
20052 - Heard this one referred to by someone as "D6 Hail"
20056
20058
20059
20060
20061
20062
20063
20064
20065
20066
20067 - All Call
20068
20072
20074
20076
20078
20080 - Austin?
20082 - Red Wing?
20084
20086
20088
20090 - Winona?
20092
20094