1.3 - The exit numbers are the same as mile markers in Minnesota. Calculate the number of miles from Oxford St (exit 45) to Jackson (exit 73). (\"Mile markers\" are little signs that most states put on the sides of their major highways, which display the number of miles from a designated location, such as the state line. There is a picture of one in Chapter 1 Section 1 of our text. In many states, such as Alabama and Iowa, "Exit numbers" follow the pattern of the mile markers. For example if there is a highway exit half way between mile markers 214 and 216, it will be labeled as Exit 215.)