(a) You must not implement a template sampling plan at a unit that is smaller than the unit used in developing the original sampling plan. For example, if your plan is to sample 3 round trips per week, you must not implement it by sampling 3 one-way trips per week.
(b) You may choose to sample and measure at a unit that is greater than the unit used in developing the original template sampling plan. For example, if your plan is to sample 4 one-way trips per week, you may implement it by sampling 4 round trips per week instead.
(c) You may only want to do (b) during the first year of implementing a template sampling plan. For example, once you have the sample data in round trips from the first year, you should use the sample data from the first year to develop a new template sampling plan in round trips for future years.