Based on further analyses, specific "causal factors" of SI/SCP were developed; these included driver inattention (i.e., internal and external dis- tractions) (36.4 percent); ran signal (23.2 percent); tried to beat signal (16.2 percent); driver intoxication (i.e., > 0.10 blood alcohol concentration, BAC) (12.6 percent); emergency vehicles (3.5 percent); roadside objects (3.5 percent): hit and run (2.4 percent); and view obstructed (i.e., inter-