But the Home Office said admission to the UK would not be automatic if the child had an interim adoption order, such as the one granted to the Kilshaws in Arkansas last month.

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In France, unlike in Britain for example, adoption and IVF for gay couples -- alongside automatic joint parenting rights -- was still illegal until last Saturday and remains controversial, simply because it touches on the highly sensitive question of family and what family is made of.

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Indeed, it is not much of a stretch to suggest that these rules are the reason we have seen the widespread adoption over the years of employer matching contributions, automatic enrollment, automatic escalation of contributions, and numerous other innovations in the retirement plan space that have been shown to increase saving.

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But the NHTSA hopes that with more state-backed adoption, advances in vehicle-to-vehicle communication and automatic braking can more quickly be refined, thus paving the way for industry standards and eventual commercial deployment.

ENGADGET