Through the last decades, a 30 km/h speed limit was introduced in several European cities. This is not only the case in certain residential zones but, with a couple of exceptions, the whole town. There are places where this system has been in place for three decades and others where it has been introduced only recently. Many city councils have a concrete plan and schedule to introduce the same measure in the near future.
In places where these restrictions are used, there are no accounts of bad experiences. Locals had doubts initially, but they got used to the new scenario. However, the introduction of the new system was accompanied by a significant increase in the number of traffic cameras in several places, leading to privacy concerns that are justly raised.
In the past weeks, EUrologus got in touch with several affected cities to make this article; the “Italian” part was created thanks to cross-border journalistic cooperation. Beside the cities mentioned in this article, there are several others across Europe where a 30 km/h limit is the norm, not the exception. These are for example Lille, Madrid, Paris, Lyon, Grenoble, Valencia, and Bilbao.
Graz: 30 years of experience
In the south Austrian city of Graz, a 30 km/h speed limit was introduced in 1992. This applied to every street classified as a secondary road, which in practice means that this rule applies to 80 percent of streets, combined over 800 kilometers of roads.
Magdalena Markovic, the press referee of the Graz city council argues that the biggest advantage of the change is achieving safer transportation in the city. Already in the first two years of the policy, the number of traffic accidents decreased by 25 percent. As there were no other policy changes regarding safe transportation in the same time period, the success is obviously due to the 30 km/h rule. The number of accidents started to increase again since 1996, but this was due to accidents on higher-level roads, where the speed restrictions do not apply. In the 30 km/h zones the number of accidents remained constant or even decreased a little.
Markovic believes that implementing the limit on city level also saved money, as it was much less expensive than implementing individual restrictions for particular places. In addition, it was easy to understand for citizens. The speed limit policy was accompanied by several surveys. After the initial doubts, nowadays the majority of residents support the 30 km/h limit. Some of the critics were afraid that there would be an increase in traffic jams, but this was not the case according to available statistical data.
Helsinki: visible results
We got in touch with Heikki Palomäki, the head of the transportation systems department of the city council of the Finnish capital. In Helsinki, the first wave of introducing large-scale 30 km/h restrictions took place in 2004, then the system was extended in 2019. First, it was used in the city centre and some residential areas, then speed restrictions were modified in effectively all the streets. The adjustments were made in a way that they affect the traffic entering and leaving residential areas and the city centre as well.
After the 2004 change, in the streets with lower speed limits traffic accidents resulting in personal injury decreased by 9 percent. In places where the speed limit was changed from 40 km/h to 30 km/h pedestrian injuries decreased by 19 percent and vehicle damages by 34 percent. The biggest improvement was observed in the city centre, where the number of traffic-related injuries decreased by 42 percent.
Heikki Palomäki pointed out that it is very important that authorities monitor speed via a camera system. Currently, approximately 30 cameras are in place on the streets, and 40 more will arrive in the next few years. After a camera was place in Kaivokatu street in the inner city, mean speed lowered to 23.5 km/h and the number of accidents decreased from 2.2 per year to 1.1 per year.
In Helsinki, they do not monitor public opinion on this issue, but based on the reflections of the media it seems that citizens are satisfied. There is also a recent, 2022 poll concluding that 77 percent of Helsinki citizens feel safe in traffic, and only 5 percent answered that they find transportation in the Finnish capital dangerous.
Brussels: raising awareness with cameras
In Brussels, the 30 km/h speed limit is very recent, only two years old. On the other hand, in the Belgian capital, the measure was not introduced in stages but it instantly applied to the whole city. Only the busiest, usually multi-lane roads are exempt from the restrictions. At the same time, 70 km/h signs that were applicable for entry roads and basically non-populated areas were also removed.
Inge Paemen, spokesperson of the Brussels city council told EUrologus, that the main goal of the speed restriction was to improve road safety. Pedestrians have a five times higher risk of death in an accident with 50 km/h speed than one with 30 km/h. In the case of car drivers and passengers, the risk of serious injury or death in an accident at 50 km/h is 45 percent, while at 30 km/h only 15 percent. Break distances are also lower at a lower speed: 13 meters at 30 km/h and 27 meters at 50 km/h. According to science, lower speeds also improves the range of visibility, which is 102,17° on average at 30 km/h, while it is 75,46° at 50 km/h.
“Further benefits of speed limits include cleaner streets, quieter areas, more fluent traffic, and better health, since more people choose to walk or cycle” says Inge Paemen. In Brussels, annual speed measurements take place at 80 spots in the city. They show that speed did actually decrease, but travel time did not increase significantly.
In order to convince citizens, the city council considers communication and raising awareness crucial, but speed checks play an essential role too. At the moment there are 85 single-direction cameras available to check speed and crossings of red traffic lights, and 28 dual-direction cameras, that only record speed. In addition, the city council is funding the establishment of 7 mobile speed cameras per week on regional and city roads.
Zürich: accepted via referendum
Sabina Mächler, the city’s communication project manager, answered our questions for Zürich. In Switzerland, the federal law determines a 50 km/h speed limit for cities, but “in the spirit of proportionality, in order to increase road safety, help traffic and reduce pollution” a 30 km/h limit can be applied. Based on this, the city of Zürich introduced speed limits step by step. They started to use 30 km/h speed limits in residential areas in 1991, and then they introduced a 30 or 20 km/h speed limit in other smaller streets without public transport in the past years, covering 370 kilometres out of the 680 kilometres of total roads within the city.
A new wave of 30 km/h restrictions will be triggered soon. It will also involve larger streets, including those with public transport. There will be exceptions: on some main roads that connect Zürich to neighboring cities 50 km/h will remain the speed limit. In November 2021 the citizens of Zürich approved the infrastructural plan of the city with a referendum, this involves the speed limits as well. A survey conducted with 900 participants revealed that 70 percent of people were happy that