If the vehicles are in the order of 1, 2, and 3, which vehicle goes first?

The understanding of the order of the vehicles relies directly on the given sequence, which lists the vehicles as 1, 2, and 3. This numbering indicates their specific positions, with the lowest number representing the first position in the order. Since vehicle 1 holds the first position, it is designated as the vehicle that goes first in line. This reasoning underpins the logical sequence of how the vehicles are organized and ensures that the vehicles are identified correctly based on their numerical arrangement.