If I get in an accident, the body of the car can protect me, but if I'm in an accident on a motorcycle, there's nothing around my body to protect me, so it's even more dangerous.
この場合、次のような言い方ができますよ。
ーIf I get in an accident, the body of the car can protect me, but if I'm in an accident on a motorcycle, there's nothing around my body to protect me, so it's even more dangerous.
「もし事故にあったら車の車体が私を守ってくれるけど、バイクで事故にあったら、私の体を守ってくれるものが何もないので、もっと危険だ」
ご参考まで！
カナダ 
