(Bloomberg) -- A senior Toyota Motor Corp. executive is urging the federal government to keep states from setting their own autonomous vehicle rules, something carmakers say could threaten the emerging industry with a patchwork of contradictory regulations.

"A clear and unequivocal statutory or regulatory prohibition on states regulating vehicle performance of autonomous vehicle technology would help to halt or prevent the emergence of a patchwork of state laws," Gill Pratt, CEO of the Toyota Research Institute, said in testimony prepared for a House subcommittee hearing on Tuesday.

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