Five teenagers died after a BMW drove the wrong way on the M9 at about 3 a.m. on Aug. 16 and hit a Hyundai, critically injuring three sisters and a 7-year-old boy heading to Dublin airport.
Police believe the masked youths had broken into homes and cars in County Kildare and were trying to bait patrols into a chase; several had posted reckless-driving videos online before the crash.
TikTok-style filming has become central to the behavior, experts said, with drivers simultaneously recording for likes and status, intensifying older joyriding patterns through social media exposure and live-stream culture.
More than €660,000 has been raised for the injured family, while abuse directed at the dead boys' relatives led funeral notices to be withdrawn and prompted church appeals for restraint.
The crash has widened pressure on Ireland to tighten dangerous-driving penalties, improve Garda pursuit training and scrutiny, and force social media platforms to answer calls for stronger regulation.