ROYALTON (WJON News) -- The Minnesota Department of Transportation is studying 30 miles of Highway 10 between St. An upcoming public meeting will specifically address needed improvements for the highway in the city of Royalton. minnesota department of transportation minnesota department of transportationThe study looks to address ongoing access, mobility, and safety issues. Some of those issues include numerous at-grade crossings, hard left turns, and traffic signals in Royalton and St. For more information, visit the MnDOT Hwy 10 Study St.