you are likely to find Door in/at/on Bus. you are likely to find Door in/at/on Car. Car is a different concept from Truck. Truck is related to Move. 
Undertake is a type of Confront. 
Bus <--AtLocation-- Door --AtLocation--> Car <--DistinctFrom--> Truck <--RelatedTo--> Move 
Confront <--IsA-- Undertake 