 In 1919 when the state highway system was first numbered, the north – south highway through Pontiac was numbered M-10, and it was renumbered to US 10 seven years later when the United States Numbered Highway System was created. A number of highway designation and routing changes in the Pontiac were made when US 10 was shifted out of downtown to replace M-58 along Telegraph Road west of downtown by the middle of 1961. Before the change, US 10 followed Dixie Highway and Oakland Avenue southeast into Pontiac to Perry Street and then Perry to Woodward while M-58 was routed along Telegraph and Square Lake Roads. After the change, US 10 turned south from Dixie Highway onto Telegraph and then east onto Square Lake to connect back to Woodward. The old route through downtown was assigned the Bus. US 10 moniker and M-58 was decommissioned as a highway designation. Nine years later, US 10 was moved off Woodward Avenue between Pontiac and Detroit to follow the Lodge Freeway and Telegraph Road. Bus. US 10 was extended westward along Square Lake Road from the intersection of Woodward Avenue to the junction with Telegraph Road so that it would continue to connect with its parent highway on the southern end. In 1985, the Michigan Department of Transportation received permission from the American Association of State Highway and Transportation Officials to truncate US 10 to Bay City, and when the change was made the following year, US 24 replaced US 10 on Telegraph Road north of Square Lake Road, and Bus. US 10 through downtown was redesignated Bus. US 24.
