Research cited by TT Club shows that dehydration reduces short-term memory, attention span and reaction times. A 2023 UK study found that inadequately hydrated drivers made the same number of errors as individuals with blood alcohol content of 0.08% – equivalent to the drink-drive limit.
With water comprising 73-75% of the human brain, even mild dehydration meaningfully impairs cognitive function. In cargo-handling environments where workers operate heavy machinery, work at height and navigate complex physical hazards, impaired judgement and slower reaction times pose serious safety risks.
‘The comparison with alcohol is striking and should serve as a wake-up call for operators,’ said Neil Dalus, Risk Assessment Manager at TT Club. ‘We would not tolerate a worker starting a shift having consumed alcohol. Yet, dehydration, which can produce some equivalent impairments, is often treated as a minor welfare issue rather than a genuine safety risk.’
Dehydration risk extends beyond hot climates. Workers wearing personal protective equipment in cooler environments experience significant fluid loss through sweating, making it a year-round hazard. Prolonged heatwaves across Europe and North America are exposing workers in temperate regions to unfamiliar physiological pressures.
TT Club recommends operators install accessible water stations, schedule regular hydration breaks, provide reusable water bottles, deliver dehydration awareness training and use monitoring tools such as urine colour charts or wearable hydration monitors to identify at-risk individuals.
