Is it OK to go on non-secondary roads occasionally, and to make traffic stops there?
It is acceptable to travel on non-secondary roads (U.S. and Michigan highways) if it is necessary to get from one secondary road to another in an expedient manner. If you observe a motorist violating a traffic law while on the non-secondary road, you can stop and issue a citation. However, you should not be doing stationary enforcement on a non-secondary road, or patrolling on one for extensive periods of time.