# Why Do Some US Roads Have Two Different Speed Limit Signs? - SlashGear

> Why Do Some US Roads Have Two Different Speed Limit Signs? The first national speed limit law limiting speed to 55 mph was enacted in 1974 by then-President Richard Nixon as part of the Emergency Highway Energy…

- **Source:** [SlashGear](https://www.slashgear.com/2232301/why-are-there-two-speed-limit-signs-us-roads/?utm_source=gearopen.com&utm_medium=referral&utm_campaign=feed&utm_content=6a7d0bf9adf27c99287ff2cc)
- **Published:** 2026-08-13
- **Category:** Cars
- **Tags:** #surface
- **Canonical:** http://localhost:4321/a/6a7d0bf9adf27c99287ff2cc

---

_GearOpen's distilled summary. The full original article is published at SlashGear (source link above); GearOpen does not republish the source's full text._