What term describes a trip that follows from point A to point B and then to point C on the same route?

The term that accurately describes a trip that follows from point A to point B and then continues to point C on the same route is "pass-by." This concept refers to instances where a traveler makes a detour to stop at an intermediate location (point B) while ultimately having a final destination (point C). In this case, there is a continued movement along the same route, reflecting the characteristic of a pass-by trip where the traveler does not return to their original starting point at A but rather continues onward to C.

A direct trip typically implies a non-stop journey from one destination to another without deviations, which does not fit the scenario described in the question. A round trip suggests going to a destination and then returning to the starting point, which also does not align with the described trip. A one-way trip means traveling from a starting point to a destination without any stops or returns, again not fitting the context of making an intermediate stop along the way. Thus, "pass-by" is the term that encompasses the concept of a journey stemming from point A to B and then onward to C, maintaining the same route throughout.