You cannot reduce these things disparately; an increase in safety will reduce all fatalities across the board and thus inequity will still exist. So the only way to make it more equitable is to raise majority roadway fatalities.

So... Maybe make it legal to drink and drive if you're white? Or they get their own 80mph speed limit on overpasses, sharp turns, and bridges? Oh! Seatbelts optional, no max car capacity. Every white person gets a Ford Pinto for free!