Fatal crashes caused by young drivers inflict untold suffering on survivors and the loved ones left behind. But what about the trauma experienced by first responders?  They are part of the so-called ripple effect caused by the aftermath of tragedies on UK roads - and their stories are rarely told.  Niall is joined by Sky correspondent Dan Whitehead, who spoke to NHS workers about their experiences.  Producers: Tom Gillespie and Araminta Parker  Editor: Mike Bovill