(a) A major change is any change you make to your service that is likely to lead to major changes in the statistical variation in a relevant quantity of your service.
(b) The relevant quantity of your service varies with the sampling options you choose. It is PMT if you choose the base option, APTL if you choose the APTL option, etc.
(c) The following are examples of a major change:
(1) Making transfers fare-free for all passengers.
(2) Adding or cutting express routes to the base of all local service.
(3) Expanding or contracting your service by at least 25% in vehicle revenue miles.
(4) Service restructuring that affects at least 25% of your service in vehicle revenue miles.