かつ
くさび
None
When you drive a car, everyone under your roof is putting their life in your hands, even if they don't say it with their mouth—it's still under your control.
You have to maintain control of your car or you'll hit a bunch of cats (かつ). The roads are full of cats at all times. And if you lose control of your car for just a second, you'll hit at least two or three cats.
Currently there are no similar looking kanji which exist in the WaniKani learning system