An interchange is a system of interconnecting roadways in conjunction with one or more grade separations, providing for the movement of traffic between two or more roadways on different levels.
00 - No is used if the first harmful event of the crash occurs outside of the boundaries of an interchange.
01 - Yes is used if the location of the first harmful event of the crash is within an interchange area.
99 - Unknown is used if it is unknown if the location of the first harmful event of the crash was within an interchange area.
