Accidents, Fatigue, and Road Safety: DGT Rules and Risk Factors

1️⃣ Bus accidents and contributing factors

Traffic accidents pose a serious threat in Spain, both in terms of mortality and economic impact 💸. Crashes involving passenger transport are especially sensitive due to the potential number of victims.

🔍 Main causes:

  • 👤 Human factor: causes between 70% and 90% of crashes.
  • 🌧️ Road and environment: 10% to 35% of accidents (poor road condition, adverse weather, etc.).
  • 🚐 Vehicle condition: accounts for 4% to 13% (tyres, brakes, lights, etc.).

📌 Characteristics of work-related crashes:

  • On duty (en misión): while performing work activities.
  • Commuting (in itinere): trips to/from work. These are the most frequent.

⚠️ High-risk areas:

  • More crashes on straight sections due to distraction 🛣️.
  • Interurban roads = more fatal because of higher speeds.
  • Motorways/dual carriageways are generally safer.

🚀 Speed and vision:

The higher the speed, the narrower the field of view (tunnel effect), the greater the impact energy, and the longer the stopping distance.

📏 Key distances:

  • Reaction time: ≈ 0.75 seconds.
  • Reaction distance: distance travelled during that time.
  • Braking distance: from pressing the brake to a full stop.
  • Stopping distance: reaction distance + braking distance.

2️⃣ Fatigue and drowsy driving 😴

Drowsiness and fatigue are present in up to 30% of accidents, especially among professional drivers.

⚠️ Symptoms:

  • Body aches, frequent position changes.
  • Slow movements and frequent errors.
  • Loss of concentration and increased reaction time.

🛠️ Factors that worsen fatigue:

  • Driver: prolonged driving without breaks, poor posture, alcohol, illness, etc.
  • Road: heavy traffic, poor condition, bad weather.
  • Vehicle: poor suspension, steering, or climate control.

💤 Drowsiness:

  • Leads to very serious crashes.
  • Risks arise even before actually falling asleep.
  • Microsleeps, blurred vision, serious mistakes.

✅ Recommendations:

  • Stop and rest at the first sign of fatigue (20–30 min).
  • Avoid heavy meals and high temperatures.
  • Use climate control between 20–23 °C.
  • Rely on milled lateral rumble strips (GSLF).

3️⃣ Illnesses and medicines 💊

Chronic or acute illnesses can negatively affect road safety. It is recommended to:

  • Know your symptoms and triggers.
  • Avoid driving during episodes or with side effects.
  • Consult your doctor about risks.

Avoid mixing medicines without prescription, drinking alcohol, or self-medicating.

4️⃣ Heat, distractions, and substances 🚫

🔥 Driving in high temperatures:

  • Can be equivalent to driving with a 0.5 g/L blood alcohol level.
  • Increases distractions, aggressiveness, and drowsiness.

📱 Distractions:

  • Cause up to 40% of accidents.
  • Internal factors: mobile phone, fatigue, stress, conversations, etc.
  • External factors: poor lighting, confusing signs, heavy traffic.

🍷 Alcohol and drugs:

  • 🔴 Driving is prohibited with the presence of drugs or above legal alcohol limits.
  • 🠀𐇪𘁁lcohol tests: breath analysis or lab tests.
  • 🚓 Officers may immobilize the vehicle.
  • ⚖️ Penalties: €500–€1,000 + loss of 4–6 points. Criminal offense in severe cases.

5️⃣ Points-based license 🪪

  • Start with 12 points (8 if a novice or after recovery).
  • Bonuses for good conduct: up to 15 points.
  • Minor offenses: loss of 3 points.
  • Very serious: up to 6 points.
  • Automatic recovery in 2–3 years without sanctions.
  • 🧠 Re-education courses: 12 h (recover up to 6 pts) or 24 h (after total loss).

6️⃣ Active and passive safety elements 🛠️

✅ Active (preventing accidents):

  • 🛞 Tyres: pressure, tread, type, maintenance.
  • 🛑 Brakes: ABS, EBS, brake booster, retarders.
  • 🛏️ Suspension: leaf springs, shock absorbers, air cushions.
  • 🔄 Steering: maintenance, pressure, alignment.
  • 💡 Lights: maintenance, aiming, types (xenon, adaptive).
  • 🚗 Systems: ESP, ASR, speed limiter.

🛡️ Passive (mitigating consequences):

  • 🧱 Frame and bodywork.
  • 🪟 Laminated glass.
  • 🔗 Seat belts.
  • 🎈 Airbags.
  • 👓 Visibility: wipers, mirrors, climate control.

7️⃣ Efficient driving 🌍

Reduces fuel consumption, improves comfort, and helps the environment.

🔋 Techniques:

  • Start without accelerating.
  • Shift up in the tachometer’s green zone.
  • Avoid unnecessary braking and acceleration.
  • Use engine braking and retarders.
  • Plan the route and avoid short or unnecessary trips.

🛑 Switch off the engine during long stops. Look after the particulate filter and air conditioning. Service the vehicle regularly.


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