(a) One common method involves one or more ride checkers observing and recording passenger activities while riding in a transit vehicle.
(b) An increasingly common method uses APCs to record passenger activities instead.
(c) You may use one of these or any other method to collect the data from each service unit of your random sample as long as your method meets these criteria:
(1) it obtains data from direct measurement or direct observation without passenger intercept,
(2) it provides data you must have to determine PMT for each service unit, and
(3) it meets the requirements on measurement accuracy in the NTD Reporting Manual.