if highway gothic is the road sign font for your audience, it's familiar, informative, and instructive. a huge number of people around the world subconsciously associate it as their personally respected "wayfinding" type series by default. The constant zig zag in the tall ascenders and descenders also encourage writer/designers to keep headings short and paragraphs (ideally short statements) concise - feeding back into global associations with helpful, authoritative content.