A number of States have been approached about erecting signs for the USDOT’s Marine Highway program, administered by MARAD. The Marine Highway system essentially promotes transport of goods via navigable waterways as an alternative to landside highways. Each Marine Highway waterway is designated with a route number that corresponds to the nearest Interstate highway that it roughly approximates as an alternative route between destinations. The route number is preceded by “M-” (e.g., M-95 runs along the East Coast as an alternative to I-95).
 

The Federal Highway Administration announced a memorandum to issue an Interim Approval  for the optional use of two-stage bicycle turn boxes.