Question

みみ

ここでのbehindの品詞と文構造が分かりません。教えて頂きたいです。

could increase danger] Unfortunately, this means limits are sometimes set
at unsafe levels.
yox Critics also point out that the United States is behind other nations
when it comes to vehicle-safety regulations. In the United States, safety
regulations are ( 30 ). Although some vehicles have become larger
and their shape has changed, laws have not changed to reflect the
increased danger they pose to pedestrians. Critics say that regulating only
the safety of vehicle occupants is irresponsible, and that pedestrian deaths
have increased even though there are simple measures that could be
taken to help prevent them.

Answer 1

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taka

ここでのbehindの品詞と文構造が分かりません。→　behind …：前置詞(…に遅れて)、構文は以下のようになります。
Critics(S) also point out(V) [that(接続詞) the United States(S1) is(V1) (behind other nations)(M) <when(接続詞) it(S2) comes(V2) (to vehicle-safety regulations>](O).
批評家たちはまた、[＜自動車の安全規制に関して言えば＞、米国は他国に遅れをとっている]と指摘している。
※point out …　…を指摘する　when it comes to …　…に関して言えば

参考にしてください。