Factors that Reduce Driver Abilities | DGT Road Safety

Road safety largely depends on the driver’s physical, mental, and emotional condition. Here we analyze the main factors that reduce a driver’s abilities. 🚗⚠️


😴 1. Fatigue and Sleepiness

🚨 Consequences of Fatigue

  • 🤕 Aches, muscle stiffness, and a feeling of heaviness.
  • 🐌 Slowness and lack of precision in movements.
  • 🎯 Reduced attention and concentration.
  • 😠 More hostile and aggressive behavior.
  • ⏱️ Increased reaction time.

⚠️ Factors that Worsen Fatigue

  • 🚫 Little experience.
  • 🕐 Long periods of driving without breaks.
  • 💺 Poor posture.
  • 🚀 High speeds.
  • 🍷 Alcohol, drugs, or illness.
  • 🚧 Heavy traffic or poor road conditions.

💤 Sleepiness and Its Effects

  • 👁️ Blurred vision and microsleeps.
  • 😵‍💫 Slower movements and decision-making.
  • ⛔ More distractions and errors.
  • 📆 Critical times: 3–5 a.m. and 2–4 p.m.

✅ Tip: Take a break every 2 hours of driving! 😌


💊 2. Illness, Medications, and Allergies

🏥 Common Illnesses

  • 🤧 Flu, allergies, colds → reduce concentration.
  • 🧠 Mental or neurological disorders → higher risk.

🩺 Advice for Chronic Conditions

  • 🔎 Know your symptoms and avoid driving when they appear.
  • 🚫 Do not drive during flare-ups or acute episodes.
  • 🥃 Do not mix medications with alcohol.

🌸 Allergies

They cause eye strain, drowsiness, and misjudgments. ⚠️ Some antihistamines increase drowsiness.


😖 3. Stress and Depression

🔥 Stress

  • 🤬 More aggressiveness and recklessness.
  • 🧭 Slower decisions and mistakes.
  • 📵 More distractions and fatigue.

😢 Depression

  • 🀀󚸏 Less attention to important stimuli.
  • 💤 Fatigue, anxiety, and irritability.
  • 💊 Use of psychotropic medications that affect driving.

💉 4. Alcohol and Drugs

🍷 Effects of Alcohol

  • 🔄 Distorted perception of distance and speed.
  • 🧠 Reduced concentration and coordination.
  • 💥 Impulsive and aggressive behaviors.
Type of Driver Blood Alcohol Limit
Novice (<2 years) and professional drivers 0.15 mg/l air or 0.3 g/l blood
Other drivers (incl. cyclists) 0.25 mg/l air or 0.5 g/l blood

🧪 Drugs and Their Effects

  • 🌿 Cannabis → drowsiness and slower reflexes.
  • 💊 Ecstasy → blurred vision and later fatigue.
  • 🔮 LSD → hallucinations and panic.
  • ⚡ Amphetamines → impulsivity and rebound effect.

  • 🚓 Mandatory tests in case of accident or suspicion.
  • 💶 Fine up to €1,000 and loss of 4–6 points.
  • ⛓️ Driving with >0.60 mg/l: up to 6 months in prison.

🛵 6. Vehicle Factors

🛺 Mopeds

More unstable and vulnerable in the event of a crash.

🎮 Vehicle Controls

  • 🤚 Handlebar: steering, throttle, brakes, lights.
  • 👣 Feet: rear brake and gear shift (if equipped).

🧍 Rider Position

  • 🪑 Comfortable posture with arms slightly bent.
  • 👣 Feet on the footrests, firmly placed.

🚗 7. Light Quadricycles

🪑 Position and Controls

  • 👐 Hands on the wheel at 10 and 2 o’clock.
  • 🦵 Legs slightly bent, back upright.


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