Very stupid questions for those in the know

[Ataros]

If you create NPC units with car script you can assign a spline road to them as a target. The script will make them travel along this road back and forth.

Other scripts may be similar but some are rudimentary.

There is a thread in this section regarding units removal with script examples. (search for destroy actor or actor destroy).

Repka1 mission with one example can be found in Multiplayer section in the MP Missions thread.