Americans becoming too heavy for current buses

From USA Today:

It's official: The federal government says more overweight Americans are squeezing onto buses, and it may have to rewrite bus safety rules because of it. The Federal Transit Authority (FTA) proposes raising the assumed average weight per bus passenger from 150 pounds to 175 pounds, which could mean that across the country, fewer people will be allowed on a city transit bus...

Current federal guidelines on average passenger weight are based on surveys in 1960-62 of what Americans weighed then. Today, the Centers for Disease Control and Prevention says, the average weight is 194.7 pounds for men 20 and older and 164.7 pounds for women that age range... The Federal Aviation Administration, which oversees airline travel, gauges average passenger weight at 190 pounds in the summer and 195 pounds in the winter. The Coast Guard's assumed average weight is 185 pounds for boats and ferries.