In the couple of years that i've had the cooler thermostat in, my fan has only kicked in three times at low speed and never kicked into high speed (note that this is my daily driver and gets driven a lot). It sits right on the first line on the gauge and really doesn't move much from there, I have to sit stationary for a LOOONG time for it to reach the point where the thermo fan will start up, red lights just dont last that long.
However traffic jams do.