Drive Awake · Perspectives · Law
A trial without measurable evidence. Ten years on, the question raised by the Quinto case is still open: how do you prove a danger that leaves no trace?
AnalysisTen years ago, on 26 July, on the A2 motorway near Quinto, a crash was traced back to sleep apnoea the driver did not know he had. No alcohol, no deliberate distraction: a silent, undiagnosed medical condition. The facts are gathered in the Quinto case; here we follow only the question it left open.
The law rests on proof. For alcohol there is a value in the blood; for speed, a recorded figure; for distraction, often a phone log. Not for sleepiness. It leaves no residue in the body, appears in no record, cannot be measured at the scene. By the time a crash has happened, the proof that the driver was sleepy almost always no longer exists. Clues remain - no braking, the hour, the dynamics - but not a measure.
Swiss road traffic law places responsibility before the journey: whoever is overtired is not fit to drive (art. 31 SVG/LCStr). It is a rule of prevention. But the trial looks backward, trying to establish what the driver knew or should have known. With an undiagnosed condition - a silent apnoea - even that line becomes uncertain.
Research is now starting to give sleepiness a measurable trace. A study by the IRM in Zurich identified markers in saliva linked to sleep deprivation (DOI 10.1021/acs.jproteome.5c01064): a proof of principle, not yet a roadside tool, and under independent clinical validation. It does not change the Quinto case. But it points a direction: what left no trace is beginning, perhaps, to leave one.
The open question
A test is not there to punish afterwards. It is there to help stop beforehand. If one day sleepiness has a measure, it will not be to find someone to blame once the crash has happened, but to recognise the risk while there is still a choice to make. Prevention, not prosecution: that is what the limit of proof is about.
Quinto case: crash on the A2, undiagnosed sleep apnoea. Anniversary 26 July.
Swiss Road Traffic Act (SVG/LCStr, RS 741.01), art. 31.
IRM Zurich saliva study, DOI 10.1021/acs.jproteome.5c01064.
Independent clinical validation study in progress (identifier NCT07089342).
Stay awake, on the road and in life.