Major Forest Service roads around here generally have two names: a number, and a textual name. For example, one road is interchangeably referred to as "Lightning Creek Road" and "Road 419", including on signs (signs might have one name, the other, or both). How should I handle this?

Major Forest Service roads around here generally have two names: a number, and a textual name. For example, one road is interchangeably referred to as "Lightning Creek Road" and "Road 419", including on signs (signs might have one name, the other, or both). How should I handle this?