PUSHING FOR MORE KANJI USAGE!!!
Hopefully, someday, this will be an accepted answer.
I keep reporting them. I believe all words should be accepted in either kana or kanji, otherwise things are too inconsistent and unpredictable.
It is now! (2019-02-07)
It marked me wrong when I wrote this using the kanji. I've reported it (1/30).
交「コウ」 - mix
差「サ」 - distinction
点 「テン」- point
Uh... What is an intersection? I've heard Americans use the term but it's not used in the UK. Would I be correct in saying it's a crossroads?
Yes it is called crossroads, or cross junctions, or road junctions
Is 交差点 also used in the mathematical sense?