What is the Driving Safety Report?

The Driving Safety Report is a free tool that analyses current weather conditions and calculates how they affect your driving safety. Unlike basic weather apps that just show temperature and rain, this report translates weather data into actionable driving advice — stopping distances, following gaps, grip levels, and safety scores tailored to your vehicle and location.

How Does It Work?

The report runs on UBPS v3.5.1 (Ultimate Braking Physics Simulator) — a proprietary 19-factor physics engine developed by Taylor Houghton. Validated against 10,000+ real-world test scenarios, it achieves an R² of 0.9999 and a mean error of just 0.71% — making it one of the most accurate braking calculators publicly available anywhere.

When you select a location, the tool fetches live weather data including temperature, precipitation, humidity, wind, visibility, and dew point. It then calculates:

• Stopping distance at 50, 80, and 100 km/h based on road surface grip
• Following distance using the 2-second rule, adjusted for conditions
• Tyre pressure changes caused by temperature fluctuation
• Hydroplaning threshold using the NASA formula
• Fog risk based on dew point spread, with timing forecasts
• Overall safety score combining all factors

Who Is This For?

The Driving Safety Report is designed for everyday Kiwi drivers who want to make informed decisions before hitting the road. It's especially useful for:

• Commuters — check morning conditions and best departure times
• Parents — understand road safety before school runs
• Fleet managers — brief drivers on daily conditions
• Learner drivers — understand how weather affects stopping
• Long-distance travellers — plan for changing conditions across regions

What Makes This Different?

Most driving safety tools give generic advice like "drive carefully in rain." This report gives you specific numbers: your stopping distance increases from 63m to 89m in these conditions. That extra 26 metres could be the difference between stopping safely and a collision.

Our proprietary physics engine considers factors that most calculators ignore: tyre EU wet grip grades, tread depth, tyre age, vehicle type, road surface, temperature effects on rubber compounds, and even whether you're towing a trailer. We built this because no existing tool came close to modelling real-world braking accurately.

Coverage

The tool covers 280+ locations across New Zealand, Australia, and selected international cities. Weather data is sourced from Open-Meteo, with road incident data for NZ locations pulled from NZTA.

Related Tools

This report is part of a suite of free driving safety tools we've built at Tyre Dispatch — all designed to give Kiwi drivers real data, not generic advice:

• Braking Simulator — experiment with all 19 physics factors interactively
• Temperature PSI Calculator — see exactly how today's temperature affects your tyre pressure
• Following Distance Guide — learn the 2-second rule with visual examples
• Tyre Pressure Guide — comprehensive PSI advice for all driving scenarios
• WOF Tyre Guide — check if your tyres will pass a Warrant of Fitness
• Tyre Size Calculator — compare sizes, speedometer impact, and fitment changes
• AI Tyre Scanner — photograph your tyre sidewall and our AI reads it for you

Shop Tyres by Category

Your driving safety starts with the right rubber. Browse our NZ range with free shipping:

• All-Terrain Tyres — versatile on-road/off-road performance
• Mud-Terrain Tyres — aggressive tread for serious off-road
• Highway-Terrain Tyres — smooth, quiet highway comfort
• Passenger Car Tyres — everyday sedan, hatchback & wagon sizes
• 4WD Tyres — built for New Zealand conditions
• EV Tyres — low rolling resistance for electric vehicles

Exclusive NZ distributor for Predator Tyres (USA-designed performance 4WD) and Anchee Tyres (full passenger & SUV range).

Validation Accuracy by Surface Condition

Mean Absolute Percentage Error (MAPE) across test categories. Lower is better.

Highest accuracy on sealed surfaces where friction models are well-characterised. Ice and gravel show slightly higher variance due to surface irregularity — still well within acceptable engineering margins.

Test Scenario Coverage

Distribution of 10,000+ validated scenarios across test dimensions.

All 19 Physics Factors

Every variable modelled in UBPS v3.5.1, each derived from peer-reviewed research.

60+ Sources Across 5 Research Categories

Full methodology, validation tables, and individual source citations are documented in the Braking Simulator technical appendix — including the complete friction coefficient model, all 19 physics factors, and accuracy benchmarks against every test category.

Our Research Library

Every calculation in this report traces back to primary sources we've personally collected, translated, catalogued, and validated. This isn't spec-sheet surfing — it's years of systematic research.

Research Depth by Category

Primary and secondary sources personally collected, processed, and integrated into our tools.

Counts represent distinct documents, datasets, and source files — not individual data points within them. Many databooks contain hundreds of pages of specifications.

We pull from every credible source available — manufacturer specifications, independent testing organisations across Europe and internationally, government transport research, academic textbooks, certified laboratory braking results, and real-world test data published by recognised bodies like ADAC, TCS, and Continental. We source technical catalogues directly from manufacturers in Japan, Europe, and Asia, translate them where needed, and extract the data points that matter: friction grades, load capacities, compound characteristics, and wear profiles across conditions. On top of that, we personally inspect thousands of tyres every year — photographing, measuring, and cataloguing every detail. Over time, that hands-on work reveals patterns you simply cannot get from a spec sheet: which brands and grades wear in predictable ways under specific conditions, how treadwear ratings actually correlate with real-world longevity, what combinations of compound grade and temperature rating tend to produce specific failure types like premature sidewall degradation. That kind of pattern recognition only develops from seeing the tyres up close, across thousands of examples, year after year.

Everything we collect — whether it's from a European test facility, a Japanese technical databook, or a tyre we inspected this morning — gets cross-checked against every other source in our library. If a data point conflicts with what independent testing, published research, and our own inspection records all show, we investigate until we understand why before it goes anywhere near our calculators. So when this report says a B-rated tyre at 4mm tread stops 12 metres longer than an A-rated at 7mm, that number has been validated against every available data source and verified from every direction before it reaches your screen.

Frequently Asked Questions

Is it safe to drive today?
Use our free Driving Safety Report to check current conditions for your location. It analyses live weather data and calculates a safety score from 0-100 based on factors like road grip, stopping distance, visibility, wind, and fog risk. Scores above 80 indicate excellent conditions; below 50 suggests extra caution.

How does weather affect my stopping distance?
Wet roads increase stopping distance by 35-50% compared to dry conditions. At 100 km/h, a car that stops in 63 metres on dry road may need 85-95 metres on wet road. Heavy rain can push this beyond 100 metres. Our report calculates your exact stopping distance based on current weather, your vehicle type, and — in Advanced Mode — your specific tyres.

What following distance should I keep?
The standard 2-second rule means keeping at least 2 seconds of travel time between you and the car ahead. At 100 km/h, this equals about 56 metres (roughly 12 car lengths). In wet conditions, increase to 4 seconds. With a trailer, use 4-6 seconds. Our report automatically calculates the right gap for current conditions.

Does temperature really affect my tyre pressure?
Yes — tyre pressure changes by approximately 1 PSI for every 5-6°C temperature change. A cold snap dropping temperatures by 15°C overnight can reduce your pressure by 2-3 PSI, affecting grip, wear, and fuel economy. The report shows your adjusted pressure and when to check it.

Is it safe to tow my trailer/caravan today?
Towing requires extra caution in any conditions. Stopping distance increases by about 40% with a loaded trailer. Combined with wet roads, you may need twice the normal stopping distance. Enable "Towing a trailer/caravan/boat" in our report to see adjusted calculations and following distances.

What is hydroplaning and when does it happen?
Hydroplaning (aquaplaning) occurs when water builds up faster than your tyres can disperse it. Your tyres lose contact with the road, and you lose steering and braking. Risk increases above a threshold speed that depends on your tyre pressure and tread depth — typically 75-90 km/h in standing water. Our report calculates your personal threshold.

When is the best time to drive today?
Conditions vary throughout the day. Fog risk peaks around 4-7am. Sun glare is worst within 2 hours of sunrise/sunset. Rain may come and go. Our report analyses conditions hour by hour and recommends the safest departure times for morning, midday, and afternoon travel.

How do I use this report for a road trip?
Check conditions at your departure location and destination. Compare safety scores for different departure times. If travelling through alpine areas, check the Alpine Conditions panel for freezing level and chain requirements. For long trips, check the 6-day forecast to plan around bad weather.

What do the tyre EU grades mean?
EU tyre labels rate wet braking performance from A (best) to G (worst). An A-rated tyre stops up to 18 metres shorter than an F-rated tyre at 80 km/h — that's roughly four car lengths. In Advanced Mode, you can enter your tyre's EU grade for more accurate stopping distance calculations.

The wet grip section (right column) is the one that matters most for braking. Look for it on your tyre's packaging, or check the listing on our tyre shop — we display EU grades on every product page. Learn more about reading tyre labels in our WoF Tyre Guide.

Why does my safety score change during the day?
Multiple factors fluctuate: temperature affects tyre pressure and grip; rain comes and goes; fog forms and clears; UV and sun glare peak at different times; wind gusts vary. The report recalculates everything when you change the time selector, so you can find the optimal driving window.