In 2008, Swedish twins Ursula and Sabina Eriksson made national headlines in the UK. The sisters' strange behavior on the M6 Motorway captivated the public. Many questions remain unanswered, one being, "Could the tragedy that followed have been prevented?"

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Episode Sources:

BBC Madness In The Fast Lane full 49min - video Dailymotion

The Swedish Twins Who Ran into Traffic - Global Grey ebooks

The Twins Who Ran Into Traffic Before Stabbing a Man to Death (vice.com)

Folie à deux—the psychosis of association; a review of 103 cases and the entire English literature, with case presentations. (apa.org)

Shared Psychotic Disorder - StatPearls - NCBI Bookshelf (nih.gov)