Lookout Vigilance Alert: Even at lower metabolic rates (~115W), stationary safety lookouts in direct sun reach severe cognitive degradation in <35 mins, leading to phone distraction and train collision risks.
Natural WBGT (Env)
29.8°C
Outdoor unadjusted
Effective WBGT (PPE)
39.8°C
+10.0°C PPE Penalty
Max Safe Work Run
15 min
Before Tcore > 38.5°C
Hourly Hydration Req
1.0 L/hr
Electrolyte replacement
🔥 Core Temp (Tcore) vs Exposure TimeLimit: 38.5°C (ACGIH)
👀 Lookout Scanning Vigilance DecayDistraction Risk Index
Continuous track work restricted to 15 minutes per hour. Mandatory 45 minutes of active cooling in air-conditioned shelter or shaded mist station. Lookout must be rotated every 30 minutes.