This is the best summary I could come up with:

ISA isn’t exactly a new feat; many vehicles have had the ability to reproduce speed limit signs for the driver for years.

It generally works by vehicles using various visual systems to pick up on posted speed limit signs and often combines that with built-in navigation map data.

“You need to know things about the road network that you cannot see to know how fast you can drive everywhere,” VP and GM of Google Geo Automotive Jørgen Behrens tells The Verge.

The first is HD maps that include lane and localization object data to build up autonomous driving systems.

And the third is the ISA map, which provides accurate and up-to-date speed limit data that helped the Volvo EX30 pass certification with the EU.

Self-driving tech company Mobileye has also built an EU GSR-passing Intelligent Speed Assist that could work with other vehicles.

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