The freeway generally uses Parclo A2 and Parclo B2 designs for interchanges. Exceptions include the Front Street interchange in Sarnia, which is a hybrid of a diamond and Parclo B2 interchange (previously a Parclo AB2 until the mid-2000s), and the Highway 40 interchange which is a Parclo B-4. There is presently no interchange using the full six ramp Parclo A4 layout (a common design on other Ontario freeways) on the entirety of Highway 402; although several interchanges do have five ramps, while the junction with Indian Road was previously a Parclo A4 until the directional ramp in the NW quadrant was removed and replaced with a signalized left turn in the late 1990s.