All rights reserved)ANN ARBOR, Mich. – Mayors from 11 Big Ten cities sent a letter to the conference requesting four additional safety measures be taken ahead of football season. After it was originally postponed until the spring, the Big Ten football season was reinstated last month and will begin this weekend. On Tuesday, 12 mayors -- 11 from Big Ten cities, as well as the mayor of Lansing -- sent a letter to the league requesting a few additional precautions be put in place. Work with local and county health officials to agree on a positivity rate that would make a city unsafe to hold a game. “We know the history of football games within our cities,” the letter says.