Stopping distances on a dry or wet road & driving tip

Stopping distances: speed and braking

The simple truth about speeding is: the faster you go, the longer it takes to stop and, if you crash, the harder the impact. Even small increases in speed could have severe consequences. If a pedestrian steps out into the path of an oncoming vehicle which is speeding the difference could be a matter of life or death.

The stopping distances on the infograph are calculated based on the following assumptions:

  • In an emergency the average  driver takes approximately 1.5 seconds to react
  • A modern vehicle with good brakes and tyres, after braking, is capable of stopping at approximately 7 m/s2.
  • A dry road that is sealed and level enables good friction between the tyres and the road to help stop the vehicle sooner.  Scientifically, it has a coefficient of friction of approximately 1.
  • A wet road that is sealed and level has less friction between the tyres and the road which increases the stopping distance of a vehicle.  Scientifically, the coefficient of friction of approximately 0.7.

The stopping distances in the graph are generic and may be influenced by a number of driver, vehicle and environmental factors:

Driver factorsVehicle factorsEnvironmental factors
  • Attention
  • Vehicle age
  • Road surface
  • Fatigue
  • Type and condition of brakes
  • Road gradient
  • Impairment due to alcohol and drugs
  • Type and condition of  tyres, including tyre pressure
  • Road alignment
  • Vision issues
  • Safety features fitted to  the vehicle for example ABS, ESC, EBA, etc.
  • Weather conditions
  • Driver age and experience
  • Vehicle weight
  • Hazard perception ability
  • Towing a trailer or  carrying a heavy load

Stopping distances on a dry road

The following table shows the distance needed to stop on a dry road in an average family car.

SpeedReaction distanceBraking distanceTotal stopping distance

Stopping distances on a wet road

The following table shows the distance needed to stop on a wet road in an average family car.

SpeedReaction distanceBraking distanceTotal stopping distance

Driving on unsealed roads

Not all roads are sealed with bitumen. Driving on unsealed roads can be more difficult than driving on bitumen.

Unsealed road surfaces include gravel, sand or dirt. These surfaces can make your tyres lose traction with the road. You should decrease your speed when travelling on these roads and increase the distance between you and the vehicle in front.

Weather can also affect driving conditions on unsealed roads. Some examples of how weather affects your driving include:

  • dry weather can create dusty conditions and limit your visibility
  • wet weather can make roads muddy, slippery and boggy.

Driving in dusty conditions

Dust can be caused from strong winds and driving on unsealed roads. These conditions can reduce your visibility on the road.

If you are driving through dusty conditions:

  • pull over, stop and wait for the dust to settle
  • turn on your lights so other vehicles can see you.

Driving in sandy conditions

Driving on sand is very different to driving on a sealed road surface. Sand over the road can make your vehicle lose traction when driving. You should avoid sharp turns, drive slowly and keep up your momentum to avoid spinning your wheels.

Sand locations such as beaches are not suitable for vehicles other than 4WDs. When driving a 4WD on sand, make sure you:

  • engage 4WD locking hubs and use low gears
  • deflate your tyre pressure for better traction—carry an air pump and re-inflate when you drive on hard surfaces
  • bring a jack and shovel in case you get stuck or need to change a tyre
  • pack your vehicle correctly with the heaviest items stored low—don’t over-pack your roof racks as this can make the vehicle overturn
  • make sure you have a first-aid kit and call 000 in an emergency.

Beach driving

You can drive 4WDs on many beaches and inland tracks throughout Queensland—first check if you need a vehicle permit. There are also extra restrictions for driving a 4WD on Fraser Island.

Normal road rules apply with beach traffic being 2-way—so remember to keep left, obey the signed speed, wear your seatbelt and never sit outside the moving vehicle.

When driving on the beach:

  • travel at low tide or within 2 hours either side of the low tide
  • avoid salt water—stay on the harder sand between the waterline and the high tide mark to get the firmest driving surface
  • avoid rocks, pools, and washouts
  • watch out for pedestrians, wildlife, other vehicles and landing aircraft.

Driving on country and remote roads

When driving in the country or along remotely located roads:

  • reduce your speed before nearing the edge of the road—the edge may drop off or have loose stones
  • keep 1 wheel on the bitumen due to the unstable nature of road edges.
  • if you’re driving towards the west, the afternoon sun can affect your vision from 4pm
  • keep an eye out for livestock and wildlife on or at the side of the road, especially at night. Slow down and beep your horn if you see animals at the edge of the road about to cross.

Driving near heavy vehicles

Heavy vehicles are heavy and long. They take longer to stop and accelerate than smaller vehicles and require more room when turning. If you are driving behind a heavy vehicle, keep a 2-second distance between you and the heavy vehicle—double this distance in bad driving conditions.

Tips when driving near heavy vehicles include:

  • do not cut in front of heavy vehicles because you reduce the driver’s breaking distance
  • do not speed up when a heavy vehicle overtakes you.
  • if you are behind a heavy vehicle and you cannot see its side mirrors then assume that the heavy, vehicle driver cannot see you
  • do not tailgate a heavy vehicle. You cannot see what is ahead of it and you won’t be able to react in time
  • never overtake a turning vehicle that has a DO NOT OVERTAKE TURNING VEHICLE sign displayed—it is dangerous and you can get a fine.

Overtaking a road train

Road trains are large truck and trailer combinations more than 19m long. You should only overtake when it is safe and road markings indicate you can.

Before you overtake:

  • allow enough time to overtake
  • stay back at the recommended following distance (2 second distance) without crossing the centre line when preparing to overtake
  • look out for soft shoulders, guide posts and wildlife as you overtake
  • when it’s safe to overtake, indicate, accelerate and overtake quickly without exceeding the speed limit. Changing down a gear may give you enough engine power to get past
  • maintain your speed so the road train does not have to brake after you overtake
  • Do not overtake a turning vehicle at an intersection, unless it is safe to do so.

Browse our latest car database to discover more cars                    

Articles from the main page

Browse the latest new cars

Discover the latest new cars

The world’s most popular roadster, the Mazda MX-5, has a whole new look. After 25 years and over 947,00 sales worldwide, the new fourth-generation 2014 Mazda MX-5 (known as the Mazda Miata in the US) has finally been revealed. The MX-5 is one of Mazda’s most iconic models
All-new Mazda MX-5 Roaster
The centrepiece of the Mercedes-AMG GT, the new 4.0-litre V8 biturbo, responds instantly with extreme power right from low revs and delivers outstanding performance.
The new Mercedes-AMG GT
The Alfa Romeo has become synonymous with style. Many people crave the look of an Alfa. However, this car is not a one trick pony. It performs as well as it looks. For many, they feel that they have to compromise style over speed. With an Alfa, this is simply not the case.
The Classic Alfa Romeo Montreal: Is it Worth the Hype?

Sport car of the month

Discover All-new Jaguar F-Type Coupe & R


All-new Jaguar F-Type Coupe & R

5-liter supercharged V8 engine and will reach 60 mph in 4.0 seconds, and a top speed of 186 mph (electronically limited)2. The F-TYPE S Coupe and F-TYPE Coupe are powered by 3-liter supercharged V6 engines in 380hp and 340hp forms respectively, giving 0-60 mph in 4.8/5.1 seconds and top speeds of 171/161 mph2.

The F-TYPE Coupe visual message is defined by three key ‘heart lines’, that visual message beginning with the formidable grille. It is from the twin ‘shark gill’ openings that sit either side of the grille that the essential first heart line – which mirrors the design of the F-TYPE Convertible – flows and begins to take shape. Running up through the headlamp, and accentuated by the LED ‘J blade’ signature running lamps, the line then arcs up over the front wheel arch before dropping elegantly as it runs through the door, washing out into the muscular rear haunch.

The second heart line begins at the rear edge of the door, swelling outwards and upwards to create a visually strong wheel arch, emphasizing the car’s rear-wheel drive layout, before dropping vertically through the tail lamp ...

Auto Mechanic Advice

Advice from experienced mechanics from several fields!

Auto Speed Market is a car blog with the latest automotive, F1 and car news. Auto Speed Market is trying to provide extra
information to car enthusiasts, will be presenting new cars and concepts, prices and statistics of the automotive world.
Auto Speed Market also offer tips for buying a new car or second hand vehicle.

To reach us, please complete the form contact us.