As Americans get heftier, bus bosses are scrambling to support the extra weight. The Federal Transit Administration wants to tweak its bus-testing regulations so that they better reflect the people that will likely be riding those buses. It has proposed raising the average bus-passenger weight from 150 to 175 pounds, while boosting passengers’ average space requirement from 1.5 to 1.75 square feet. They’re also seeking to update testing procedures to be sure the buses won’t cave under the pressure of tubbier riders, AOL News reports. Click for more. (More overweight stories.)