I know there's a bit of a push here to term all accidents "collisions" which is in fact correct terminalogy. However ergo most collisions are in fact "accidents". The last part of the definition of accidents usually is the "involuntary defecation and/or unrination" which can also be a result of a collision.. therefore english majors and lawyers will argue than all collisions are accidents (unless you can prove intent.... good luck). Even though the word accident carries with it a certain air of innocence which is in fact the reason people are pushing to call all "accidents" collisions. So even though a collision can be the result of gross negligence, if the result is unintended, it is (unfortunately) still an accident.

Edit: Colesnotes version: when you look up the word accident, the definitions almost always use words such as "unforseen" and "unintended"... Even though a collision can be the result of gross negligence, if the result is unintended, it is (unfortunately) still an accident.