How to determine what the U and S designate in the Introductory Data table for the Secondary_Rds.tab

Products affected: MapInfo Pro™
The Secondary_Rds.tab of the Introductory Data that ships with MapInfo Professional have a "U" or "S" in front of the road numbers in the Route_Number column.

The "U" prefix in the Route_Number field in the Secondary_Rds.tab indicates a US route, and the "S" prefix indicates a State Route.


browser of Secondary_rds table
 
UPDATED:  August 28, 2017