What is the primary method used to show distances along Interstate Freeways?

What is the primary method used to show distances along Interstate Freeways?

• A. Subtract exit numbers
• B. Map bar scale
• C. Red Pointers
• D. Black numbers

Answer: (A)

Distances along the Interstate are conveyed by mile markers placed along the highway. Those mile markers are tied to the exits, so the exit numbers typically reflect the mile-post position where an exit occurs. Because the numbers increase with distance along the route, you can estimate how far apart two points are by subtracting the exit numbers (the difference gives the distance in miles between those points). This is the most direct roadside way to gauge distance without a map.

The other options don’t provide distance information on the roadway itself: a map bar scale is a feature of maps, red pointers aren’t a standard distance method on interstates, and black numbers alone are just numbers without inherently giving the distance between locations.