Pennsylvania is opening its roads to self-driving cars. Instead Aurora, the company working with China's Byton vehicles, clinched the first authorization with the Pennsylvania Department of Transportation (PennDOT). Earlier this year the autonomous vehicle software maker raised $8.4 million. SEE ALSO: Who is responsible when a self-driving car kills someone? The transportation department had already issued its "automated vehicle testing guidance" back in July and several companies already testing in Pittsburgh said it would work within the rules that went into effect Aug. 1.