I can't say for sure, but from this article it seems that Ford had the system working in Europe before the US.
European Ford model reads speed-limit signs, slows vehicle to comply; system mulled for U.S.
www.usatoday.com
From 2015...
Ford Motor combines two driver-information and assistance technologies to come up with a system that, in effect, watches for speed cops and keeps you from breaking the limit.
Just launched on a European mode, S-Max, and possibly headed to Asia and the U.S. later, the Intelligent Speed Limiter can read speed-limit signs and slow the vehicle stay legal, by adjusting the amount of fuel the engine is getting.
Other European models warn of speed changes, but Ford claims it's first to use the warnings to control vehicle speed. The 2016 Volvo XC90 is to have a Ford-style system.
Ford sees it as a key piece of the self-driving vehicle puzzle. Already some cars can stop themselves before hitting another, and steer themselves well enough to stay within a traffic lane...
...And -- key to the system -- signs that warn of a new speed limit in Europe are common and give enough lead time for the vehicle to coast down to the lower speed. That smooths the transition and means the car needn't hit the brakes, possibly causing a rear-end crash.
Electronic sign-reading is easier in Europe, Ford says, because road signs are more precisely standardized than those in the U.S., where different shapes, sizes and colors can be used to convey the same informatio