Winds of 20 meters per second are equivalent to 72 kilometers per hour, creating critical driving conditions, especially for trucks, buses and vehicles with a high center of gravity. With such indicators aerodynamic stability the car is reduced to a minimum, and a side gust can shift the car into the adjacent lane or even overturn it at high speeds. The driver must immediately assess the need for a trip, since standard stabilization systems may not cope with the physical pressure of air masses.
This wind speed is classified as a severe storm or the beginning of a hurricane on the Beaufort scale, which imposes serious restrictions on maneuvering. On the open road windage the body works like a sail, requiring the pilot to constantly correct the steering. Ignoring the warnings of meteorologists at such indicators often leads to skids and collisions, especially if there are heavy trucks on the road that create additional turbulence.
Understanding the physical strength of such winds helps you make an informed decision about not traveling or choosing a safer route. In contrast to the calm weather, here braking distance can increase not only due to sliding, but also due to air resistance during head-on gusts. Every second spent behind the wheel in such conditions requires increased concentration and reduced driving speed.
Accurate speed calculation: convert m/s to km/h
To accurately understand the scale of the threat, it is necessary to correctly convert meteorological data. Wind speed of 20 meters per second (m/s) is the standard unit of measurement in weather reports, but drivers are more accustomed to using kilometers per hour (km/h), which is displayed on the speedometer. The conversion is carried out by multiplying the value in m/s by a factor of 3.6. Thus, 20 m/s × 3.6 = 72 km/h. This means that the air flow moves at the speed of a car driving through the city.
However, it is important to distinguish between average speed and gusts. Meteorologists often report a 10-minute average, but gusts of wind can significantly exceed this figure, reaching 25–30 m/s (90–108 km/h). It is sudden gusts that pose the greatest danger, since they act on the car body like a sharp blow. Aerodynamic pressure at such speeds it increases proportionally to the square of the speed, which makes even short impacts critical for stability.
There is a simple formula for a quick mental calculation: multiply the m/s value by 4 and subtract 10%. For 20 m/s it would be: 20 × 4 = 80, 10% of 80 is 8, totaling 72 km/h. This calculation helps you quickly assess the situation without using a calculator. Knowing this figure is necessary to understand why even on a highway with a speed limit of 90 km/h with a headwind of 20 m/s, the actual load on the suspension and engine will be colossal.
⚠️ Attention: When wind speeds are 20 m/s or higher, the movement of buses and trucks with trailers is often officially limited or prohibited by road authorities. Ignoring such restrictions may result in an accident.
The effect of such wind on different types of vehicles is not the same. Low-slung passenger cars feel more confident, but they are also susceptible to drift. Tall vans and SUVs experience significant lateral displacement, requiring constant steering. The driver must be aware that his car at this moment becomes easier to drive, but less predictable in emergency situations.
Hazard classification according to the Beaufort scale
A speed of 20 m/s corresponds to 9 points on the Beaufort scale, which is classified as a “Storm”. This is a serious meteorological phenomenon in which tree limbs break, roof tiles are torn off and pedestrian traffic is disrupted. For a motorist, this is a signal that the external environment has become aggressive. Road signs may be obscured by falling branches, and visibility may be impaired by dust, snow or rain that moves at the same speed.
During this stage of the storm, the following symptoms that affect driving are observed:
- 🌪️ Destructive Power: The wind tears down light structures, billboards and signs that may end up on the roadway.
- 🌲 Falling trees: The risk of old or diseased trees falling onto the road increases many times over, especially in forests and park areas.
- 🚗 Car demolition: Light vehicles can be completely pushed out of their lane when overtaking large vehicles.
The next level is 10 points (24-28 m/s) - this is a “Severe storm”, and 11-12 points is a hurricane. At 20 m/s we are on the border where movement is still possible, but requires extreme caution. Visibility may be limited not only by precipitation, but also by dust or snow raised from the ground. In such conditions, the use of headlights becomes mandatory, even during the day.
It is important to consider that in the city the effect is enhanced due to the “wind corridors” between high-rise buildings. Wind speeds in narrow passages can locally increase, creating dangerous turbulent zones. Drivers should avoid parking under rickety structures, trees and power lines. Safe parking in such conditions, these are underground parking lots or open areas far from potential sources of falling objects.
The influence of wind of 20 m/s on the behavior of a car
The physics of interaction between air flow and a car at a speed of 72 km/h dictates its own strict rules. The main enemy becomes windage. The larger the side projection area of the car, the stronger the wind presses on the body. This results in the need to constantly hold the steering wheel with force to compensate for drift. On wet or icy roads, this effect is enhanced, since the grip of the wheels on the surface is reduced.
Overtaking or oncoming traffic with large vehicles poses a particular danger. When a car leaves behind or meets a truck, it enters a zone of rarefaction or a sharp change in the direction of flow. This phenomenon is called wind tunnel. An instant blow to the side of the wind can lead to loss of control. At a wind speed of 20 m/s, this effect is felt as a strong shock, for which you need to be physically prepared.
Braking also becomes less effective. A headwind increases resistance, which seems to help with braking, but a side wind destabilizes the car when the wheels lock or the ABS operates. Braking distance may become unpredictable. In addition, gusts of wind can throw the car off the trajectory precisely at the moment of intense braking, when the traction of the wheels with the road is maximally loaded.
Modern driver assistance systems, such as ESP (Electronic Stability Program) and directional stability, work in enhanced mode. They brake individual wheels and reduce engine traction to stop skidding. However, at 20 m/s, the electronics may be exhausted if the physical force of the wind exceeds the grip of the tires. The driver should not rely solely on electronic assistants, but act preventively.
⚠️ Attention: If you feel that the car is starting to “float” on the road or the steering wheel is being pulled out of your hands, immediately reduce your speed to the minimum possible and look for a place to stop safely.
Driving strategy in stormy winds
Driving in such conditions requires changing your usual driving style. The first rule is to reduce speed. Driving at 60–70 km/h instead of the permitted 90–110 km/h significantly reduces the risk of drift and gives you more time to react. Distance to the car in front should be increased by one and a half to two times, since it may suddenly be carried away or it may brake sharply due to a fallen object.
Hold the steering wheel firmly with both hands. This basic rule becomes critically important. Hands should be in the 9 and 3 or 10 and 2 positions to ensure maximum control and quick response to impulses. Do not make sudden movements with the steering wheel. Any sudden change in trajectory combined with a crosswind can cause a skid. Smoothness - a key factor in survival on the road.
Be extremely careful when overtaking. Try to minimize the time you spend near large trucks. When leaving because of them, be prepared for a sharp blow of the wind. If the wind is blowing sideways, move closer to the windy side of the runway (but without driving onto the side of the road) to have some room to fend off the drift. Turn on low beam headlights to improve the visibility of your vehicle to other road users.
☑️ Checklist for preparing for a trip to a storm
If visibility has dropped to almost zero due to raised dust or snow, and the wind is picking up, the best solution is to pull off the road. Find a safe place: a gas station, a shopping center parking lot, a specially equipped area. Don't stop under bridges, trees or billboards. Wait out worsening weather. Security trumps any delivery schedule or being late for an appointment.
Wind Impact Comparison Chart
To better understand how different wind speeds affect driving, here's a comparison chart. It demonstrates how the danger increases with increasing air speed.
| Wind speed | Unit measurements | Beaufort points | Effect on the car | Recommendation |
|---|---|---|---|---|
| 10–14 m/s | 36–50 km/h | 6 (Strong) | Noticeable drift, swaying of high bodies | Slow down, be careful |
| 15–19 m/s | 54–68 km/h | 7 (Strong) | Difficult to control, possible drift to the side of the road | Hold the steering wheel firmly and avoid overtaking |
| 20–24 m/s | 72–86 km/h | 9 (Storm) | High risk of rollover, loss of control | Extremely dangerous, consider stopping |
| 25–29 m/s | 90–104 km/h | 10 (Severe storm) | The movement of passenger cars is extremely difficult | Stop moving, seek shelter |
As can be seen from the table, the transition from 15 m/s to 20 m/s is the turning point when driving goes from “uncomfortable” to “deadly dangerous”. Critical threshold For most passenger cars, the 20 m/s mark is considered, after which the risk of an accident increases exponentially.
Trucks with empty or light trailers may begin to experience problems as early as 15 m/s. For them, 20 m/s is a high risk zone for capsizing. Drivers of passenger cars should stay away from such “giants”, since if they fall or lose control it will be almost impossible to escape.
What to do if there is a sudden increase in wind
Often a storm overtakes drivers on the road. If you notice that the wind has increased to 20 m/s (trees are bending, there is a hum in the back, the car is being blown away), the action algorithm should be as follows. First of all, take your foot off the gas pedal. Do not brake suddenly unless it is directly necessary (for example, obstacles on the road). Sharp braking will relieve the front axle and enhance the windage effect.
Gradually reduce speed to 40–50 km/h. At this speed the car becomes more stable and you have more time to react. Turn on your hazard lights to warn other drivers that you are traveling at low speeds or are about to stop. Look for the exit from the main highway. Roadside in a storm, this is not a place to stop; there may be debris, branches, and you may also be hit by another car blown away by the wind.
If stopping is not possible (for example, you are on a bridge or viaduct where the wind is always stronger), try to stay in the center of the lane or slightly closer to the leeward side, but do not hug the curb. Increase your distance from cars in front. Watch out for heavy trucks: if they start to roll too much, it’s better to leave behind or, if the situation allows, safely overtake them, understanding the risks.
⚠️ Warning: Never try to avoid a fallen tree or large object on the road if the oncoming lane is busy or visibility is limited. It is better to stop and call emergency services.
Frequently asked questions (FAQ)
Is it possible to drive on a highway in a wind of 20 m/s in a passenger car?
Technically it is possible, but it is extremely dangerous. A speed of 20 m/s (72 km/h) creates a high risk of loss of control, especially on bridges, exits from forested areas and when overtaking trucks. It is recommended to reduce your speed to 40–50 km/h or wait out the storm. If the vehicle is tall (SUV, minivan), the risk of rollover increases.
How to convert m/s to km/h without a calculator?
The easiest way: multiply the number of meters per second by 4 and subtract 10% from the result. For example, for 20 m/s: 20 × 4 = 80. 10% of 80 is 8. 80 - 8 = 72 km/h. This gives a fairly accurate value for assessing the situation on the road.
Is wind of 20 m/s dangerous for parking?
Yes, very dangerous. At this speed, icicles and tiles can fall from the roof, dry branches can fall from trees, and billboards and light structures can be torn off. The car should be parked away from trees, buildings with unsafe roofs and advertising structures. Ideal - underground parking.
Why is the wind stronger on bridges?
On bridges and overpasses there are no natural barriers (trees, buildings) that dampen the wind speed near the ground. In addition, the bridge design can create a wind tunnel effect, increasing gusts. That is why speed limits and “Crosswind” signs are often installed in such areas.
Does tire pressure affect stability in strong winds?
Yes, it does. Underinflated tires have a smaller contact patch and grip the road less well, which increases the risk of skidding. Over-inflated tires reduce grip. When driving in strong winds, it is recommended to maintain the pressure recommended by the manufacturer for a full load to ensure maximum stability.