TBH I'd entirely support the NHTSA making the new mail truck's low hood height mandatory on all new vehicles. It would make being hit by an SUV have a far, far safer outcome.
“Over the past decade, automotive safety regulators in Europe have made pedestrian safety a priority. But their American counterparts have not adopted the same rules to protect people outside of vehicles. As pedestrian deaths rise alarmingly fast in the U.S., with nearly 6,000 lives lost last year, the difference between the American and European approaches to the regulation of car design stands out strongly.”