There has been plenty of threads here, rather old now though.
You could:
Turn them off via the MFD
Leave them on on MFD, and manually turn them off (for those who might speedy above 90mph)
Leave them on Auto, they will auto turn on after a few rounds of 90mph (approx) regardless of light/weather, but will revert back to Auto (i.e. off) when you have stopped at say lights etc.
Red