The distance required for braking is one of the most important priority factors in traffic safety, especially for truck drivers, whose lives and the lives of others depend on understanding driving dynamics and the laws of physics that govern the movement of vehicles.
It should be noted that the distance required for braking changes drastically with different speeds, making it crucial to be aware of the nature of this relationship to ensure safe driving.
Below we will review how the braking distance changes when you double your speed. We will explain the factors that affect this, as well as some practical tips for truck drivers to ensure safe braking on highways in the Kingdom.
Types of safe driving distances
The distances between vehicles are key factors to avoid accidents, especially in cases of emergency stop or sudden reaction.
These distances are divided into four main types, which are as follows:
It is the minimum distance that the driver must maintain between his vehicle and the vehicle in front of him in order to avoid a collision in the event of a sudden deceleration or stop.
- Parking distance
It is the total distance traveled by the vehicle from the moment the danger is noticed until the complete stop. It includes: reaction distance and braking distance.
- The reaction distance
It is the distance traveled by the vehicle during the period of time it takes the driver to make a braking decision.
- Braking distance
It is the distance traveled by the vehicle after activating the brakes until a complete stop.
Experts advise you to keep a safe distance between you and the vehicle in front of you, expect an increase in stopping distance in difficult conditions, pay close attention on highways, and do not neglect to check your car brakes regularly.
The distance you leave between you and the car in front of you may save your life and the lives of others. Safety distance is not an option that can be ignored, but a basic safety necessity that gives you enough time to act and avoid accidents.
The most important factors affecting the vehicle's safe braking distance
The distance that a vehicle needs to fully stop after applying the brakes depends on several interrelated factors, the most important of which are: the condition of the tires, the efficiency of the brake system, the nature of the road surface, and the cargo load.
All of these elements play a crucial role in determining the effectiveness of the braking process and how quickly the vehicle stops.
The condition of the tires
Tires are the point of contact between the car and the road. Several factors affect braking efficiency, including:
- The type of rubber used in the manufacture of tires, as some types provide better adhesion to different surfaces.
- The depth of the tread is an important factor as worn tires that have lost their grip become less efficient in braking by up to 30%.
- air pressure, which must meet the specifications specified by the manufacturer, as increased or decreased inflated tires negatively affect stopping distance.
brake system efficiency
It is the most direct factor in the stopping process. This system consists of brake discs, brake pads, and hydraulic oil pipes. These components wear out and lose some of their efficiency over time and frequent use, so it takes longer to stop the vehicle.
On the other hand, modern braking systems such as the “ABS anti-lock” system help reduce stopping distance, especially in difficult conditions, because they prevent wheel slip and maintain the driver's ability to steer the car during strong braking.
road condition
Its impact on the distance needed for braking cannot be overlooked. Dry and clean roads provide the best coefficient of friction between tires and road surface, thus reducing stopping distance.
On wet or wet roads, the required stopping distance may increase by 20 to 30 due to the formation of a thin water layer between the tire and the road.
The stopping distance may increase by up to 100% on slippery roads due to snow or ice. The presence of gravel or sand also significantly reduces braking effectiveness.
Truck load
The heavier the vehicle, the more power it takes to stop it, and the longer the braking distance. A fully loaded truck, for example, needs up to 40% longer stopping distance compared to empty braking.
Braking distance is not a fixed number; it is affected by tire condition, brake system efficiency, road conditions, and even vehicle load. Remember that any negligence in these factors may double the stopping distance and put you and those with you at risk.
6 tips for better braking performance and the shortest possible stopping distance
Based on the above, specialists advise you to follow these guidelines:
- Periodic inspection of the brake system and immediate replacement of damaged parts.
- Make sure to adjust the air pressure in the tires according to the instructions.
- Replace tires when the tread depth reaches the minimum allowable “1.6 mm”.
- Change your driving style to suit road conditions.
- Use gradual braking instead of sudden braking to avoid skidding.
- Drive at reasonable speeds and keep an adequate safety distance from the vehicle in front of you.
How to calculate the safe braking distance
First, the basic components of stopping distance should be clarified, which are divided into two main sections:
- The reaction distance, which is the distance traveled by the vehicle from the moment the danger is noticed until the brakes are applied, depends on the speed of human response, the driver's condition and the clarity of vision.
- The actual braking distance is the distance from the start of the braking to the complete stop. It is subject to the laws of physics of motion and friction.
We then move on to detailed calculations, according to the following formula: (speed ÷ 10) x 3 x (factor of conditions).
Where:
Speed: km/h
Factor 3: represents the average reaction time (approximately 1 second)
Condition factor: between 0.8 (ideal conditions) and 2 (difficult conditions)
A practical example:
A car is traveling at a speed of 50 km/h and needs to stop suddenly. There are two stopping stages:
- The reaction phase:
From the moment you see the danger until the brakes are applied, and your car travels about 15 meters
Calculation method: (50 ÷ 10) x 3 = 15 meters
- Braking phase:
From the beginning of pressing the brakes until the full stop, you travel 25 meters
Calculation method: (50 ÷ 10) x (50 ÷ 10) = 25 meters
Total: 15 (reaction) + 25 (braking) = 40 meters full stopping distance.
Note that in ideal conditions, these numbers are “dry road, good brakes”. In rain or difficult conditions, you need more distance, so always take an extra safety distance to avoid accidents.
There are also additional factors that affect the following:
- Mass and payload, as heavy vehicles require a greater distance are directly proportional to mass.
- Slope and slope. Slopes increase stopping distance by 5% per mile, and heights shorten stopping distance by the same percentage.
- Modern technologies, where they fall short “ABS” systems The distance is 10 to 20%, and the automated brake “AEB” reduces the reaction distance.
Practical tips to achieve a safe braking distance
- Keep a distance of 3 seconds from the vehicle in front, double the distance in the rain, and also add 50% distance when tired.
- Check the brakes every 20,000 km, changing tires at a tread depth of <3 mm.
- Use progressive braking, and avoid sudden braking on turns.
We conclude from the above that stopping distance is not just a fixed number, but a dynamic system that is affected by dozens of factors. It is necessary to have a good understanding of these relationships, as this helps you make safer decisions while driving.
The risks of not observing the safe braking distance
Neglecting to calculate the safe braking distance leads to a series of serious consequences that may threaten your life and property, including:
- Increased risk of frontal collision.
- Risk of a side impact when trying to avoid a frontal collision suddenly.
- Loss of control of the truck, especially in corners.
- Goods are damaged due to heavy braking, especially liquid or poorly fixed.
- Increased risk of tipping over, especially for trucks that are heavy or overloaded.
- rapid wear of tires Due to excessive and sudden use of brakes.
- High brake temperature, which may lead to loss of efficiency “fade brake phenomenon”.
- Increased fuel consumption due to repeated acceleration and braking.
- Vehicle body fatigue and suspension damage over time.
- The driver is physically and nervous tired due to tense driving.
- It is difficult to stop on steep roads, which increases the risk of serious accidents.
- significant financial losses due to the costs of repairs and downtime.
The fundamental difference in stopping distances between light and heavy trucks
Light trucks have a greater ability to stop quickly than their heavy counterparts, for several main reasons.
Light trucks have more responsive braking systems, with tires that provide better adhesion to the road, enabling them to reduce their speed more effectively, while heavy trucks face a greater challenge in the braking process due to their huge weights and complex braking systems.
Heavyweight trucks require significantly longer stopping distances, as they require higher braking power to balance the inertia resulting from their large mass. Air brake systems in heavy trucks operate with a different mechanism and are relatively slower compared to hydraulic systems in small vehicles.
These differences are evident in difficult conditions such as steep roads or when there is a poorly fixed load. The high temperature of truck brakes during intensive use may reduce their efficiency temporarily, increasing the required stopping distance.
Therefore, traffic safety experts recommend that heavy truck drivers leave greater safety distances and avoid high speeds, especially when carrying large weights or in difficult weather conditions, as the gap in braking performance between light and heavy trucks is clearly increasing.
Heavy trucks require a much longer stopping distance than light trucks; the weight of the cargo and the brake mechanism double the stopping time, so it is always recommended to leave a great safety distance and avoid high speeds.
5 important tips for truck brake system maintenance
As mentioned earlier, the brake system is one of the most vital systems in trucks. It has an essential role in ensuring traffic safety and protecting lives and property. Here are the top 5 tips to maintain the efficiency of the brake system:
- Perform a comprehensive periodic inspection of the system
It is recommended to check every 10,000 km or according to the manufacturer's instructions, including measuring the thickness of the brake pads, checking the wheel cylinders and testing the brake fluid level.
Air ducts in air brake systems should also be checked for leaks.
- Perform preventive maintenance
It includes changing the brake fluid every two years or 100,000 km, whichever comes first, cleaning the system components from dust and deposits regularly, and lubricating the brake system's contact points according to the technical specifications.
- Dealing appropriately with risk indicators
This is as soon as you hear any abnormal sound when the brakes are applied, the stopping distance is increased than normal, the brake fluid leaks or its level decreases, or the steering wheel shakes while braking.
- Carrying out emergency procedures
This is in the event of an immediate suspension of driving when any serious defect is noticed, not overloading the system on which it was designed, and keeping essential spare parts to deal with emergency situations.
Remember that a good brake system protects not only you but all road users, so investing in brake maintenance is an investment in safety and operational efficiency.
Therefore, we recommend that you stick to regular maintenance programs and strictly follow the manufacturer's instructions to keep system performance at optimal levels.
