Following Betsy

On the drive home, we followed the instructions from our GPS that we call Betsy.  We were about to stop for the night at about midnight and were looking for exit 108 from the I-75 where the hotel was.  We were coming up to the exit and suddenly just before we got to exit 108 the exit number changed to exit 369.  We were very confused but we kept driving.  Then a little later the exit number changed to 1.  We were even more confused but we kept driving and then suddenly we saw exit 108.  I guess the I-75 had joined with one other highway and then with another highway and the change in exit numbers was caused by the other highways.