freezing
basis
severe driving.
The Canada Honda site calls conditions severe if the car is "regularly driven in very low temp (-29 C, -20 F)."
The American Honda site (and some American Honda owner's manuals) calls conditions severe if one drives in one or more of the conditions below most of the time:
Trips of less than 5 miles (less than 10 in freezing weather) Extremely hot weather (over 90 degrees F) Extensive idling or stop-and-go driving Trailer towing, car-top carrier, or mountain driving Muddy, dusty, or de-iced roads