(a) The load-based approach is applicable to all circumstances. Under conditions of heavy loads or high boarding volumes, however, extra care must be taken to maintain the required level of measurement accuracy.
(b) The distance-based approach is useful under several circumstances. For examples:
(1) All passengers board and alight at the same locations, such as inclined plane (IP), aerial tramway (TR), and most ferryboat (FB) operations.
(2) Services with a small number of passengers who board and alight at a small number of stops, such as demand response (DR and DT).
(3) Services with a small number of frequent passengers who board and alight at a small number of stops, such as commuter vanpool.
(4) Any service with a ticketing system that keeps track of the origin and destination for every boarding with a known distance.