Which U.S. president was arrested for speeding while in office?

In 1872, President Ulysses S. Grant became the only sitting U.S. president ever arrested while in office. He was stopped in Washington, D.C., for driving his horse and buggy at an unsafe speed after ignoring repeated warnings from police. Grant reportedly apologized, posted a $20 collateral bond, and was released. The incident quickly became one of the most unusual stories in presidential history. More than 150 years later, the notorious speeding ticket remains one of the most memorable and unusual footnotes of Grant's presidency.