Have you ever caught yourself thinking that you are not driving “fast at all”, but the speedometer stubbornly shows that it is exceeding the speed limit? Or vice versa - it seemed that they accelerated to 120 km/h, but the dashboard showed a modest 90? Such illusions of speed perception - a common phenomenon that every driver encounters. The reasons lie not only in the physics of movement, but also in the peculiarities of our brain, the design of the car and even the landscape outside the window.
The danger of such illusions is that they can lead to unconscious speeding, increasing the braking distance or, conversely, excessive caution where it is not required. In this article we will look at 7 key situationswhen the real speed of the car is perceived as underestimated, and we will also explain why this happens and how to counter it. From physics to psychology - everything you need to know to always adequately assess your speed while driving.
1. Driving on a wide road with smooth surface
The wider the road and the smoother the asphalt, the stronger effect of “slowing down” perception. This is due to the fact that the brain estimates speed by changes in the picture outside the window - the so-called optical flow. On a narrow, bumpy road, objects (trees, poles, markings) flash faster, creating the illusion of high speed. And on a multi-lane highway with perfect surface, visual cues change more slowly, and the brain “thinks” that you are driving slower than you really are.
Research shows that on six-lane highways, drivers on average underestimate their speed by 10–15 km/h. For example, when driving at a speed of 110 km/h, you may subjectively feel that you are traveling “only” 95–100 km/h. This effect is enhanced at night, when there are even fewer visual cues.
- 🚗 Example: Highway M11 "Neva" (Moscow - St. Petersburg) - the width of the roadway and the smooth surface often mislead drivers.
- 📏 How to check: Compare the sensations on a narrow city street and on a highway at the same speed (for example, 80 km/h).
- ⚠️ Danger: Unknowingly exceeding 10–20 km/h increases the braking distance by 20–40%.
2. Lack of visual landmarks (desert, steppe, snowy plain)
In conditions monotonous landscape - be it an endless steppe, a snowy plain or a desert - there is nothing for the brain to “catch onto” in order to estimate the speed. Without familiar landmarks (houses, trees, markings) optical flow becomes almost invisible. As a result, the driver begins intuitively increase speed, trying to “feel” the movement, but at the same time subjectively feels that he is driving slowly.
This phenomenon is well known to pilots and is called "sensory deprivation". In a car it is less pronounced, but can still lead to dangerous situations. For example, in the steppe regions of Russia (Rostov region, Stavropol Territory) or on highways through the tundra, drivers often exceed the speed limit by 20–30 km/h without realizing it.
⚠️ Attention: On a snowy plain or in fog, the effect is enhanced by 2–3 times. If you drive in this type of terrain, check your speedometer or use cruise control regularly.
| Landscape type | Average speed perception error | Recommendations |
|---|---|---|
| City street (many landmarks) | ±5 km/h | Focus on markings and signs |
| Highway with forest belts | –10 km/h (seems slower) | Use cruise control |
| Steppe/desert | –15–20 km/h | Look at the speedometer more often |
| Snowy plain/fog | –25 km/h or more | Reduce speed by 10–15% of the permitted speed |
3. Moving in the flow: the effect of “herd behavior”
When you drive in heavy traffic, your brain automatically adapts to the speed of others. If everyone is driving 10-15 km/h faster than the speed limit, your speed of 110 km/h will be perceived as “normal”, although in fact it is exceeding. This psychological phenomenon is called "social normalization".
The danger is that the driver stops critically assessing his speed, relying on the “collective mind”. For example, on MKAD or Ring road of St. Petersburg the average speed of the flow often exceeds the permitted 90–100 km/h, and drivers simply “float” along with the others, not realizing the real speed.
- 🚙 Signs of effect:
- You don't pay attention to the speedometer, focusing only on neighboring cars.
- Your speed “adjusts” to the flow automatically.
- You are surprised when you suddenly see a speed limit sign.
- 📉 How to fight: Set up
speed limiterin the on-board computer or use applications like Waze, which warn about exceeding.
If you notice that you haven't looked at the speedometer for 10-15 minutes, this is a sure sign that it's time to consciously control your speed. Try to mentally evaluate it BEFORE you look at the instruments - often the difference turns out to be impressive.
4. Effect of vehicle size and design
The larger and taller the car, the more the driver has the illusion that he is moving slower. This is due to two factors:
- Ride height: B crossovers and SUVs the driver sits higher, and the road “runs away” from under the wheels less noticeably than in a low car.
- Noise insulation: Modern cars (eg. Volvo XC90, Mercedes S-Class) absorb wind and wheel noise so well that at a speed of 120 km/h the cabin is quieter than Lada Granta at 80 km/h.
Company Research Michelin showed that drivers premium crossovers On average, they exceed the speed limit by 8–12 km/h more often than owners of compact hatchbacks. At the same time, they subjectively feel that they are traveling “within reason.”
⚠️ Attention: If you switch from a small car to a large SUV, for the first 1-2 weeks deliberately lower your usual speed by 10 km/h. This will help avoid unconscious excess.
Why does electric cars perceive speed differently?
B electric cars (for example, Tesla Model 3 or Hyundai Ioniq 5) there is no usual engine noise, and acceleration is smoother. This creates the illusion of a slower speed. Drivers of electric vehicles, on average, exceed the speed limit by 5–7 km/h more often than owners of internal combustion engines, while feeling that they are driving “as usual.”
5. Fatigue and monotony of movement
After 2–3 hours of continuous driving, the brain begins to save resources, going into “autopilot” mode. In this state, the perception of speed is dulled, and the driver may not notice how he gradually increases speed. This is especially dangerous on long straight sections of tracks (for example, M4 "Don" or M5 "Ural").
Research Research Institute of Automobile Transport found that after 4 hours of driving non-stop 68% of drivers underestimate their speed by 10–25 km/h. At the same time, they do not feel tired and believe that they are in complete control of the situation.
Take a break every 2 hours|Drink water or coffee (but not more than 2 cups)|Play music at a variable tempo|Talk to a passenger or on the phone (via hands-free)|Take 2-3 deep breaths, tense the muscles of your arms and legs for 5 seconds-->
6. Influence of weather conditions: rain, snow, fog
It would seem that in bad weather drivers should drive slower. But in practice the opposite often happens: due to reduced visibility the brain loses its bearings, and the speed begins to be perceived as too low. For example:
- 🌧️ Rain: Drops on the windshield create the illusion of a “blanket” through which the road “floats” more slowly.
- ❄️ Snow: A white background reduces contrast and makes objects appear more static.
- 🌫️ Fog: The lack of clear road boundaries and landmarks leads to the fact that a speed of 70 km/h is perceived as 50 km/h.
In such conditions, drivers intuitively increase speed, trying to “see” the road better, but at the same time they subjectively feel that they are driving slowly. This is one of the main causes of accidents in fog or snow.
In fog or snow, your actual speed may be 20-30% higher than it appears. If visibility is less than 100 meters, reduce your speed to 50–60 km/h regardless of how you feel.
7. Optical illusions of road markings and landscapes
Sometimes the road itself “deceives” the driver. Here are some examples:
- 🛣️ "Disappearing" markup: In some areas, the markings are applied at increased intervals, which makes the car appear to be moving slower.
- 🌄 Road slope: On a gentle descent, the speed is perceived as higher, and on an ascent - as lower.
- 🌳 Trees along the road: If trees are planted at increasing intervals, a “slowing down” effect is created.
A striking example - highway A130 "Simferopol - Alushta" in Crimea, where in some areas the markings and landscape create a persistent illusion of low speed. Local drivers know that it is easy to unknowingly speed up to 120–130 km/h here, although the limit is 90 km/h.
FAQ: Frequently asked questions about perception of speed
Why does it seem like you're driving slower in a new car than in an old one?
This is due to improved sound insulation and smooth running modern cars. In older cars, wind noise, vibrations and less comfortable suspension created more feedback and speed was perceived more acutely. In a new car, the brain lacks the usual “signals” and it underestimates the speed.
In addition, modern cars are often equipped with wide profile tires with softer sidewalls that smooth out road imperfections, which also reduces the feeling of speed.
Is it true that the color of a car affects the perception of speed?
Yes, but indirectly. Bright colors (red, yellow) attract more attention on the road, and drivers of such cars are more likely to receive “feedback” from other road users (for example, signals or overtaking), which helps to adjust the perception of speed. And here are the cars gray, white or black flowers blend into the flow, and their drivers are less likely to receive such “hints.”
However, there is no direct effect of color on the physical perception of speed - it is rather a psychological factor.
Can music in a car distort the perception of speed?
Absolutely. Music tempo directly affects the perception of time and speed:
- 🎵 Fast music (120+ BPM) speeds up the brain's internal clock, making the speed seem slower than it is.
- 🎶 Slow music (60–80 BPM) or the absence of sound, on the contrary, makes you overestimate the speed.
Research Ohio State University showed that drivers listening rock or electronic music, on average drive 5–8 km/h faster than those who listen jazz or classical.
Why does speed feel different on a motorcycle than in a car?
There is no “cocoon” of the body on a motorcycle or scooter, and the driver gets much more sensory information:
- 💨 Wind: Air pressure on the body is directly proportional to speed.
- 👀 Field of view: On a motorcycle it is wider, and the optical flow is perceived more intensely.
- 🦵 Vibrations: They are transmitted directly through the steering wheel and seat.
Therefore, a speed of 100 km/h on a motorcycle is subjectively perceived as higher than the same 100 km/h in a car. This is why motorcyclists are less likely to speed unknowingly.
How to learn to more accurately estimate speed without a speedometer?
This is a skill that can be developed:
- Training on an empty road: Remember the sensations of driving at 60, 80, 100 km/h, then close the speedometer and try to guess the speed.
- Time guidelines: Time how many seconds it takes to drive between the pillars (usually they are located 50 meters apart). At 90 km/h it will take ~2 seconds.
- Use sound: Turn on the window and listen to the wind noise - it noticeably increases when passing 80-90 km/h.
- Compare with other machines: If you are overtaken, you drive slower, if you are overtaken, you drive faster.
After 2–3 weeks of such training, you will learn to estimate speed with an error of no more than 5–7 km/h.