US Forest Service signs do use ASA 2000 fonts, with varying font thicknesses, depending on the type & size of the sign for area clear cutting, but EM-7100 shows TD-x trail signs have a 1/8" width on all lettering strokes.
A freebie version is available of ASA 2000 called "Blue Highway" for large forest signs (it comes with the various width versions), and a simple open vector ASA font for trail signs.
I've gone through every letter, though, to adjust cutting start, sequence, and direction to maximize speed and minimize tear-out, and make other small adjustments in kerning, especially for fractions. Despite the 1/8" stroke spec. in EM-7100, I now use a 5/32" end mill, which really looks great, but will increase your sign width by 10% or so.