Despite widespread awareness campaigns, clear legal limits and stricter enforcement, many drivers continue to take the risks of excessive or inappropriate speed. The impact is significant: an estimated 10% to 15% of all road crashes and as much as 30% of fatal crashes are directly linked to speeding.
Why speed matters so much
The relationship between speed and crash risk is straightforward: the faster a vehicle travels, the higher the probability of crashing. However, speed not only increases the likelihood of a crash, but it also makes the consequences far more severe.
This is particularly true when vulnerable road users are involved. For instance, when a pedestrian is struck by a car travelling at 30 km/h, their chance of survival is about 90%. At 50 km/h, this survival rate drops drastically to approximately 20%. A relatively small increase in speed can therefore make the difference between life and death.
In addition to absolute speed, differences in speed between road users also play a crucial role. When vehicles travel at similar speeds, traffic flows more predictably and safely. Conversely, large variations in speed increase the risk of sudden braking, overtaking manoeuvres, and ultimately crashes.
Speeding remains widespread
Although speed limits differ across European countries, the tendency to exceed them is common everywhere. Recent research highlights how compliance varies across different types of roads and countries. On motorways, for example, compliance can range from just above 30% in some countries (e.g. the Netherlands) to over 90% in others (e.g. Bulgaria). Rural roads show similarly large differences, with compliance rates ranging from 29% (e.g. Latvia) to 96% (e.g. Bulgaria).
In urban environments—often with a standard speed limit of 50 km/h—the percentage of drivers adhering to the rules varies between 23% and 76%. These figures demonstrate that speeding is not an isolated issue, but rather a structural challenge across Europe.
Why do people speed?
There are several behavioural reasons why drivers exceed speed limits. The most common reasons include:
- Adapting to the speed of surrounding traffic
- Being in a hurry or under time pressure
- Enjoying the sensation of driving fast
- Driving out of boredom, particularly on long or monotonous roads
- Being unaware of their actual speed
In addition to these factors, demographic differences also play a role. Research shows that women are generally less likely to report speeding compared to men, and they are more likely to perceive speeding as a risky behaviour. Similarly, older drivers (aged 35 and above) tend to report less speeding than younger drivers (aged 18–34).
Interestingly, the proportion of drivers who openly accept exceeding speed limits on all types of roads remains relatively low, at less than 15%. Support for stricter measures, such as limiting speeds to 30 km/h in built-up areas and 80 km/h on rural roads without a median strip, varies between 42.1% and 64.6%.
What happens at higher speeds?
The increased risks associated with higher speeds can be explained by several physical and human factors.
First, while a driver’s reaction time remains constant, the distance travelled during that reaction time increases with speed. This means that at higher speeds, drivers need much more space to respond to unexpected situations.
Second, braking distance increases dramatically with speed. In fact, it is proportional to the square of the speed, meaning that even a moderate increase in speed leads to a significantly longer stopping distance.
Third, higher speeds reduce the time available for other road users to react. Pedestrians, cyclists, and other drivers may misjudge how quickly a vehicle is approaching, especially when it is travelling faster than expected.
Finally, speed affects perception. As drivers go faster, their field of vision narrows. At a speed of 130 km/h, the field of vision can shrink to around 30°, limiting the ability to detect hazards in peripheral areas.
How can speeding be reduced?
Safe speed is one of the key pillars of road safety. However, experience shows that no single measure is sufficient to address speeding across all types of roads and situations. Instead, a combination of complementary approaches is required.
Effective speed management includes:
- Setting appropriate and realistic speed limits that match the road environment
- Designing roads and surroundings in a way that naturally encourages safe speeds
- Enforcing speed limits through measures such as speed cameras and section control systems
- Promoting vehicle technologies like intelligent speed assistance and electronic stability control
- Supporting these measures through education and communication initiatives
Effective enforcement plays a particularly important role. Studies show that when drivers believe there is a realistic chance of being checked, compliance improves. Currently, the perceived likelihood of being caught speeding is approximately 36.4% in Europe, suggesting there is still room for improvement.
The impact of lowering speed
In response to these challenges, many cities are introducing lower speed limits, particularly a standard 30 km/h limit in busy urban areas and cities. This measure has proven to be both effective and impactful.
Scientific evidence shows that implementing a city-wide 30 km/h speed limit can reduce fatalities in road crashes by an average of 37%. Importantly, the benefits extend beyond road safety. Lower speeds also contribute to:
- An 18% reduction in emissions
- A decrease of 2.5 dB in noise pollution
- A 7% reduction in fuel consumption
- Increased levels of walking and cycling
What makes this measure particularly attractive is that these gains come with minimal impact on travel times. In practice, lowering speeds in urban areas does not significantly slow down journeys, but it does greatly improve safety and quality of life. As a result, a 30 km/h limit is considered one of the most cost-effective road safety measures available.
Moving towards safer roads
Speed management remains one of the most effective ways to reduce crashes and their severity. By combining infrastructure, enforcement, technology, and awareness, policymakers and road users can work together to create safer traffic environments.
Ultimately, the message is simple but powerful: even a small reduction in speed can save lives.
Want to discover how our members help to achieve this reduction? Here are some examples:
- Influencing driving speeds to protect wildlife and humans
- NTUA campaign of 30 Marathons in 30 months for 30 km/h speed limit in cities
- Introduction of Periodic 30km/h speed limits outside schools
- 30K Town
Have a best practice or success story to share in this area? If you are an existing member and signed in, then submit them here.
Sources:
Van denBerghe, V., Stelling, W., & Aarts, L. (2025). Trendline 2022-2025-Data collection and analysis of road safety KPIs in Europe Report details: Report Authors.
Efstathiadis, S., & Stipdonk, H. (2025). Reducing serious injuries on European roads. www.etsc.eu/pin
European Commission. (2025). Road safety thematic report - Speed and speeding. European Road Safety Observatory. www.shutterstock.com
Harkin, A. M., Nikolaou, D., Yannis, G., & Surges, F. (2024). Speeding ESRA3 Thematic report Nr. 7. ESRA project (E-Survey on Road users’ Attitudes). (2024-R-28-EN). www.esranet.eu
