To guide driverless cars, Volvo Car Group has been experimenting with creating a corridor of magnets that are placed in the pavement. The automaker says magnets are better than GPS or cameras for pointing the way because they are not as easily affected by poor weather.
"The magnets create an invisible ‘railway’ that literally paves the way for a positioning inaccuracy of less than (four inches). We have tested the technology at a variety of speeds and the results so far are promising," says Jonas Ekmark, preventive safety leader at Volvo, in a statement.
Volvo Cars has a project underway in which in which 100 self-driving Volvo cars will use public roads around the Swedish city of Gothenburg.
They are missing a citation! CA PATH designed and implemented the Magnetic Guidance System (MGS) back in 1997.
I think I saw something like this in my 7th grade Technology Education class: