السلام عليكم ورحمة الله وبركاته احسن الله اليك Is it permissible for me to ride a moped from a to b while my wife is sitting behind me? Would the wind invalidate her Hijab? It would prevent fitna of public trains. May الله give you and your family good health. بارك الله فيك و جزاكم اللّٰه خيرا

Ustadh AbdulAziz al-Haqqan
It is allowed if it does not violate the hijab.