The reason that the Police have dropped the word "accident" is that an accident is a totally random unavoidable occurrence, whereas most RTCs aren't. With the exception of sliding off on an unseen diesel spill for instance (though it could be argued that this is the result of another's negligence), most crashes involve driver error (SMIDSYs etc.) or rider error (TFF or running out of talent). Using "accident" as a label implies that nobody was at fault.