The science behind
safer driving.

Double your speed and braking distance roughly quadruples. This hands-on tool makes that visible: drag speed and reaction time, switch the surface, and see the road, the metres and the car-length count update live.

Built on the same physics as the RSA stopping-distance figures, with a dashed marker showing how much further you travel in the wet and on ice.

Traffic psychology is the scientific study of driver behaviour, decision-making and risk — and the interventions that actually reduce road deaths.

This guide covers the full picture: how your brain processes a driving situation, what happens when alcohol, speed, phones or fatigue intervene, why certain groups are more at risk, and what Irish and EU policy has proven to work.

Texting in an HGV is 23× more dangerous than alert driving — more dangerous than being over the alcohol limit. Eyes off the road for 2 seconds doubles your crash risk at any speed.

This guide covers the four types of distraction, how attention works, Irish crash data, phone law, category-specific risks for Cat B / C / D drivers, and a 6-point pre-drive checklist.

Over 90% of crashes involve a human factor — yet most drivers believe they are above average. Based on Shinar's Traffic Safety and Human Behavior (2nd Ed.) and supplemented by WHO, ETSC, and RSA Ireland official data.

Covers the global scale, crash causation models, the hierarchical driver model, speed and alcohol science, distraction types, fatigue and micro-sleeps, vulnerable road users, the Safe System approach, and evidence-based countermeasures.

Speed is not just a legal issue — it's a physics issue. Kinetic energy increases with the square of speed, meaning a 20% speed increase produces a 44% increase in impact energy.

This guide covers Nilsson's power model, pedestrian survival curves, Irish crash data on speed as a causal factor, and how Vision Zero's Safe System approach uses biomechanical limits to set survivable speeds.

Fatigue contributes to 1 in 5 fatal crashes in Ireland — and a 5-second microsleep at 100 km/h covers 139 metres with zero driver control.

This guide covers the neuroscience of sleep deprivation, BAC-equivalent impairment evidence, circadian crash timing, tachograph rest obligations for HGV/PSV drivers, and what the research shows actually works as a countermeasure.

70% of Irish driver fatalities between 10pm and 6am test positive for alcohol. Cannabis + alcohol produces 14× the crash risk of sober driving.

This guide covers how alcohol and drugs impair the driving brain, the dose-response crash risk curve, all Irish BAC limits by licence category, the DRUID study's drug-by-drug risk multipliers, and 8,863 Irish arrests in 2023.

70% of Irish fatalities occur on roads with 80 km/h limits or greater. Converting a priority junction to a roundabout reduces fatal crashes by up to 75–90%.

This guide covers expert vs novice hazard scanning science, junction type safety evidence, iRAP 1–5 star road ratings, the Safe System design framework, and why rural roads kill disproportionately more than motorways.

Only 10% of miles are driven at night — yet 40% of fatal crashes occur in darkness. At 100 km/h on low beam, you cannot stop in the distance your headlights illuminate.

This guide covers the physics of stopping distance vs headlight range, glare physiology, dark adaptation, pedestrian conspicuity science, and the Adaptive Driving Beam technology now mandated by EU Regulation 2019/2144.

Wet roads double minimum stopping distances — but two-thirds of drivers don't adjust. Ice reduces friction by 85–95%, extending stopping distance at 80 km/h from 58m to over 400m.

This guide covers the physics and data behind weather-related crash risk, a full stopping distance table by speed and surface condition, aquaplaning onset speeds, tyre tread science, and Irish fog light legal requirements.

26% of Irish road fatalities in 2023 were aged 16–25. One peer passenger doubles crash risk; two or more quadruples it. Inexperience — not youth — explains most of the elevated risk.

This guide covers the neuroscience of the adolescent brain, crash rate experience curves, peer passenger research, risk homeostasis theory, and the evidence base for Graduated Driver Licensing programmes.

Rollover crashes account for 33% of all traffic fatalities while representing only 3% of crashes. Doubling cornering speed requires 4× the grip from the same tyre contact patch.

This guide covers the physics of every cornering manoeuvre, the understeer vs oversteer distinction, how ESC works, and why loaded HGVs can roll at just 0.2g of lateral acceleration — compared to 0.8g+ for a passenger car.

174 people died on Irish roads in 2024. 90% of crashes involve a human factor — but most also have a concurrent road or vehicle factor. Speed contributes to 30–35% of fatals; alcohol to 25–30%.

This guide covers crash reconstruction science, EDR data, Ireland's full 2019–2024 fatality record, the EU CARE and ERSO databases, contributory factor breakdown, and progress against the EU 2050 Vision Zero target.

The average gap on Irish motorways is under 0.9 seconds — less than half the rule. Two seconds covers roughly your reaction time and almost nothing else: it is an absolute minimum, not a safe target.

Built from the RSA Rules of the Road, Roadcraft 2025 and MIT human-factors research, this review covers where the rule comes from, when it holds, when it fails, the pros and cons, and what to actually drive.

The most rigorous trial ever run found basic training cut crashes "as little as 5% — possibly 0". Worse, old skid-control courses made young drivers more likely to crash by inflating confidence.

A fact-checked review of the peer-reviewed evidence — and why the training that does work targets judgement and hazard perception, not car control.

97% of drivers report being dazzled by oncoming headlights, and around 55% have cut their night driving because of it. But the science is more nuanced than "blinding LEDs".

A fact-checked review of the 2025 UK Department for Transport research — what actually impairs your vision, what's in your control, and why the rules may need to change.

Newer isn't automatically safer — a properly aimed halogen can beat a misaimed LED. And a "laser headlight" doesn't shine a laser on the road.

A safety-framed, fact-checked tour of all four technologies: what each does for your vision, what it does to oncoming traffic, and how adaptive beams are starting to fix glare.

A rear fog light is bright enough to obscure your own brake lights — and the Highway Code says exactly that. Research shows competing red light delays brake detection by ~0.11 s.

A fact-checked guide to when fog lights help, when they harm, and why "better safe than sorry" gets this one backwards.

Only about 8% of serious teen-driver crashes come from losing control of the car. Nearly nine in ten trace to failures of seeing and deciding — skills that good training builds directly.

Built from eight peer-reviewed studies, this review covers the scale of young-driver risk, the famous "careless or clueless" debate, the error data, and the training approaches with real evidence behind them.

Head-on overtaking crashes happen at the combined speed of both vehicles — and most follow one of a handful of predictable traps.

Built from Roadcraft 2025's overtaking chapter and the RSA Rules of the Road: the three questions to ask first, the three-stage system, reading other drivers, and the passing rules for cyclists and horses.

Position comes before speed in the system of car control — a well-placed car rarely needs to do anything dramatic.

Built from Roadcraft 2025's positioning chapter: the three road positions, threading past parked cars, seeing into blind junctions, crossroads craft and the stopping habit examiners watch for at every queue.

How often do you brake to match the car in front? If the answer is "always", your anticipation is arriving late.

Built from Roadcraft 2025's vehicle-control chapter: the classic acceleration mistakes, why smoothness is a safety feature, holding a constant speed through bends, and the drills that build the skill in a week.