In my
understanding,
reindeer are not very bright animals. If one just happens to be
grazing along the side of the road, getting his or her daily suply of
exhaust-tainted grass, and a
huge,
noisy,
fast,
lighted elephant on wheels decides to come zipping down the road
in excess of 100 kph, the reindeer probibly is frightened out of his or her wits. After a
quick excretion segment that, if the reindeer wore such
articles, would
fill his or her pants, the reindeer
zips as quickly as possible in whatever direction he or she is facing in order to excape this
steel elephant. The reindeer doesn't bother to alter its direction to avoid such a creature because, as I mentioned
before, it's inteligance is not up to par with most
pencils. Most of the time, however, the reindeer is facing the
road, so
instinct actually works against the animal's survival.
I'm just guessing, but it sounds pretty logical.