Publications
1-10 of 19
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Speed Management
Guide for Safe Speeds: Managing Traffic Speeds to Save Lives and Improve Livability
March 2024
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Speed Management
Speed Management Research: A Summary Comparison of Literature Between High-Income and Low and Middle-Income Countries
February 2024
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Speed Management
Speed Management: A Road Safety Manual for Decision-Makers and Practitioners (2nd ed.)
November 2023
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Speed Management
Road Crash Trauma, Climate Change, Pollution and the Total Costs of Speed: Six Graphs That Tell the Story
July 2022
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Speed Management
Guide for Determining Readiness for Speed Cameras and Other Automated Enforcement
July 2022
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To briefly identify the powerful practical value of AE in saving lives and reducing injuries.
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To identify issues and criteria to be considered before commencing automated enforcement. To identify steps to be taken to achieve readiness for automated enforcement. To identify issues to improve existing automated enforcement systems.
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To provide a checklist to ensure adequate consideration is given to issues to assess readiness to implement an AE system or improve an existing system.
- Evaluate the effectiveness of the reduced speed limits in terms of crash reduction through a before-after study.
- Examine if the speed limit change had different effects across different crash types, user types, and crash severities.
- Evaluate the impact of speed limit change on transit speed through a before-after assessment.
- Develop appropriate and actionable recommendations for departments of transportation in developing countries.
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Road Infrastructure
Guide pour l’Intégration de la Sécurité dans la Conception des Routes (French)
July 2022
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Speed is one of the main road safety risk factors and is universally recognized as the leading contributor to road fatalities and serious injuries. But there is good news: the speed problem is solvable. Interventions that are proven to be effective exist, and it is well understood where and how they should be applied.
The newly published “Guide for Safe Speeds: Managing Traffic Speeds to Save Lives and Improve Livability” outlines interventions that work and provides guidance on how to select and implement speed limits that are safe for all road users. It also explains how barriers to changing traffic speeds—which are often based on lack of knowledge or misunderstandings—can be overcome.
A primary feature of the guide is its comprehensiveness. The guide covers all types of roads—from city streets to inter-urban roads and motorways (existing or new); all types of road users—from vulnerable road users such as pedestrians and cyclists to heavy motorized traffic; all types of speed limit changes—from national general speed limits to localized changes based on risk factors; all types of challenging constraints—from lack of resources to lack of data; and all types of countries—from low-income to high-income.
Low- and middle-income countries (LMICs) have been experiencing growth in vehicle travel and mobility but have not yet realized road safety gains experienced by high-income countries. Excessive and inappropriate speed is known to be a major cause of road crashes, injuries and deaths. Thus, speed management is considered a key initiative for improving road safety outcomes worldwide and has been applied successfully in most high-income countries.
Proven interventions do not necessarily have the same impacts in LMICs, or may not be feasible to apply, due significant differences in traffic mix, road user behavior, road design and vehicle standards.
This document summarizes current available knowledge about speed, its effects on safety, mobility and emissions, along with potential safety effectiveness of speed management initiatives in the LMIC context. Knowledge gaps for LMICs are clearly referenced for further consideration.
The knowledge summary provides a useful reference for practitioners wishing to inform themselves about traffic speeds, their selection and impacts on safety outcomes, mobility and emissions. The LMIC knowledge gaps will be useful in considering future research and data priorities.
The WHO, World Bank, FIA Foundation and Global Road Safety Partnership (GRSP) produced a series of good practice manuals, following the publication of the World report on road traffic injury prevention in 2004, which provide guidance on implementation of interventions to address specific risk factors in road safety. The topics covered in the initial series of manuals were: helmets (2006), drinking and driving (2007), speed management (2008), seat-belts and child restraints (2009), data systems (2010), pedestrian safety (2013), road safety legislation (2013), powered two- and three-wheeler safety (2017) and cyclist safety (2020).
Since the series of manuals was first published, the scientific evidence base relating to various risk factors and the effectiveness of interventions have continued expanding. Contemporary research has refined our knowledge about specific risk factors, such as distracted driving, and vehicle impact speed and risk of death for pedestrians. New issues and practices have arisen, such as a tropical helmet standard and an anti-braking control standard for motorcycles. New and existing interventions have been implemented and evaluated, with increasing application in LMICs. Research attention and policy response have also increasingly been applied to emerging road safety issues including e-bikes, drugs other than alcohol, fleet safety, urban mobility, micro mobility options, air and noise pollution, public transport and technological advances.
As a result of these developments, the good practice manuals required revision so that they can continue to be key references for road safety policy implementation and research. This is particularly important, given the emphasis placed on road safety within the framework of the 2030 Agenda for Sustainable Development and because of the global impetus to reduce road deaths and injuries, resulting from the declaration of the two United Nations’ Decades of Action for Road Safety (2011–2020 and 2021– 2030). The manuals have been revised to reflect these developments as they continue to be valuable resources providing evidence-based and cost-effective solutions to save lives and reduce injuries.
The management of speed remains one of the biggest challenges facing road safety practitioners around the world and calls for a concerted, long-term, multidisciplinary response. The speed at which a vehicle travels directly influences the risk of a crash as well as the severity of injuries sustained, and the likelihood of death resulting from that crash. This manual advocates for a strong and strategic approach to creating a Safe System, with speed management at its heart. Reducing motor vehicle speeds in areas where the road user mix includes a high volume of vulnerable road users, such as pedestrians and cyclists, and on non-divided rural roads, is especially important.
Walking is a predominant mode of travel in Addis Ababa representing more than half of the daily trips. The mild climate in Addis Ababa is conducive for this healthy and green mode of transport. However, sidewalks are often narrow, uneven, obstructed, or non-existent, causing discomfort and road safety risks to the most vulnerable road users: pedestrians. Studies done by the WHO and the Government showed that AA has disproportionately high pedestrian fatalities.
The study on Addis Ababa Sidewalk Safety and Improvement takes the approach of integrating digital technology and Urban Inventory in sidewalk surveys, applies the Global Walkability Index in sidewalk assessments, and adapts the global best practice to the local context. The Addis Ababa Sidewalk Design and Maintenance Guidelines seek to promote the development of quality pedestrian infrastructure and environments, based on the condition’s assessment and global best practices. The design specifications and visual rendering provide recommendations for the policy makers to consider when developing the City’s design and maintenance standards for urban roads, sidewalks, public spaces, and transit-oriented development, some of which are being carried out as part of the technical assistance program of the World-Bank financed Transport Systems Improvement Project (TRANSIP).
What is the real cost of speeding on people and the environment? These 6 graphs tell the story ⌵︎
The impacts of speed on the safety of road users, on congestion, on pollution, and on total costs of road travel are broadly misunderstood: often based on wrong assumptions, with effects taken as self-evident, failure to consider multiple impacts, externalization of costs by many stakeholders, and under-estimation of impacts (especially economic costs of higher speeds). The purpose of this brief note is to provide information on these relationships relevant to fundamental road transport policies, design, and operation. Well-established evidence shows the importance of managing travel speeds for road safety, for efficiency, for improved inclusion, and for greenhouse gas (GHG) and other emissions. Thus, speed management is a strong policy lever for the breadth of issues which must be addressed for sustainable mobility.
Reduced speeds of travel represent a major, yet under-appreciated, opportunity to improve safety, climate change impacts of travel, health, inclusion, the economy, and in some circumstances, congestion. Speed management can be achieved through a range of interventions including road infrastructure and vehicle technology, as well as enforcement and promotion.
The six graphs presented in this note tell a powerful story, across the range of these benefits of speed management.
This publication is also available in:
After almost two decades of experience with Road Safety Audit (RSA) Worldwide, this procedure is now recognized as one of the most efficient engineering tools. RSA is a highly efficient and cost-effective engineering tool for improvement of safety on roads. It is much cheaper to identify road safety deficiencies in the process of design than later after construction is completed. RSAs are among the most cost-effective investments a Road Authority can undertake.
With its EU Directive No. 2008/96 and amendment 2019/1936 on road infrastructure safety management, the European Union (EU) made a clear decision that RSA will be mandatory for the Trans-European Road Network (TERN) and main roads. This Directive contains another tool called Road Safety Inspection (RSI) on safety deficiencies of existing roads. The RSI is very similar to the process of Road Safety Audit in the pre-opening phase of newly constructed roads. RSIs are essential for the redesign and upgrading of existing roads, and these are done in many countries to give the designers insights and direction for safety improvements. Given that, the purpose of this practical guide is to provide practical guidance to those doing RSAs and RSIs, the examples of typical design deficiencies shown should be useful to both road safety inspectors and road safety auditors.
This document draws on the more comprehensive guidelines and manuals on Safety engineering mentioned in the acknowledgements but deliberately focuses only on these issues of direct relevance to road safety auditors/inspectors and to the road safety reports that they must prepare, including of recommendations for improvements.
This is a special edition of the guide, adapted for Ukraine road safety conditions and legislation, funded by the World Bank‘s Global Road Safety Facility (GRSF) under the Bloomberg Philanthropies Initiative for Global Road Safety (BIGRS).
This guide has been prepared to assist a jurisdiction to determine the level of readiness to move to automated enforcement (AE). Speed cameras enforcing speed limits are a common application of AE and there are many systemic legal and operational elements that must be in place before AE can be effective. For example, an accurate image of a speeding vehicle, in the absence of robust driver licensing and vehicle registration systems, is of little road safety value. Importantly, automated speed enforcement should be considered as one part of a comprehensive speed management approach that includes road infrastructure and roadside policing as well. The management of speed is a fundamental element of the Safe System.
Aims of this document:
Other illegal behaviours, including disobeying a red light signal, mobile or cellular phone use, incorrect lane use, and non-restraint use can also be detected using an automated enforcement approach. However, this document applies specifically to automated speed enforcement, because speed management requires significant attention worldwide and plays a critical role in reducing road traffic deaths and injuries.
Document also available in French, Portuguese, Vietnamese and Spanish.
Significant research has been undertaken on how changes in speed limit—for example, the introduction of 30 kilometers per hour, or kph (20 miles per hour, or mph) speed limits—impact safety both when combined with, and without "traffic-calming" engineering treatments such as speed humps or raised platforms. However, most of the studies have been conducted in Australia or countries in Western Europe, with almost no recorded studies from Asia, Africa, the Americas, and Eastern Europe. Though it may be reasonable, a well-developed infrastructural environment such as that found in Korea would expect similar results as that of the western countries, a study originating in Asia could have a strong demonstration effect and prove very convincing for many Asian countries.
With this in mind, the main aim of this study is to present the findings from Korea’s reduced speed limits on safety performance and to support the establishment of suitable speed-management strategies based on a quantitative data-driven approach. The scope of the project was as follows:
To start, this report first provides a brief literature review on the concept of Safe System speed limits, and the effect of speed limit reductions as part of speed management in several countries, followed by a brief description of the evaluation methods for the before-after assessment. This is followed by a summary of the findings, a set of recommendations, limitations of this study, and finally, a capsule of future research that could be undertaken to either extend or follow up on the study.
Ce guide se concentre sur les éléments des conceptions de routes et de bordures de route sûres pour les réseaux routiers qui peuvent offrir une mobilité sûre à tous les usagers de la route.
Une réduction substantielle des décès sur les routes ne sera réalisable que si des efforts concertés sont déployés, en suivant l'approche du « Système sûr » impliquant tous les éléments de la sécurité routière, de la gestion et de la prestation. Cela inclut tous les piliers du Système sûr — à commencer par la gestion de la sécurité routière, les routes et bordures de route sûres, la vitesse sûre, les véhicules sûrs, les usagers de la route sûrs et les soins post-accident. Ce guide se concentre sur les éléments des conceptions de routes et de bordures de route sûres pour les réseaux routiers qui peuvent offrir une mobilité sûre à tous les usagers de la route, ainsi que sur les changements complémentaires pour améliorer les vitesses, la sécurité des véhicules, les comportements des usagers de la route et les soins post-accident. Une conception équilibrée des routes doit prendre en compte ces éléments complémentaires du système pour maximiser les avantages en termes de sécurité. L'énergie portée par un objet en mouvement est proportionnelle au carré de sa vitesse. Une « bordure de route indulgente » bien conçue garantit que cette énergie est dispersée en cas de collision et, par conséquent, moins d'énergie est transférée aux occupants.
La conception des infrastructures routières joue un rôle vital dans les résultats en matière de sécurité routière. Des infrastructures sûres soutiennent les autres piliers de la sécurité routière en encourageant un comportement approprié des usagers de la route (comme une vitesse appropriée et une position correcte sur la voie) et en offrant un environnement routier indulgent en cas d'erreur. Une infrastructure routière mal conçue peut entraîner des comportements dangereux des usagers de la route. Une des principales réalisations de l'approche du Système sûr est que les conducteurs font des erreurs et continueront à en faire, même si nous pouvons réduire leur fréquence. Cette erreur des usagers de la route a longtemps été reconnue comme un contributeur significatif aux mauvais résultats en matière de sécurité routière. Cependant, les routes, pour une vitesse donnée, peuvent être conçues pour réduire la probabilité de collisions, et il existe des preuves très claires que la gravité des résultats lorsque des collisions se produisent est significativement influencée par la conception de la route. Même si une collision se produit encore, une infrastructure routière améliorée peut sauver de nombreuses vies et prévenir des blessures débilitantes.
L'approche du Système sûr souligne qu'une réponse partagée est nécessaire pour aborder la sécurité routière. Cela signifie que les usagers de la route continueront à assumer la responsabilité de leurs actions, par exemple en étant vigilants et en respectant les règles de la route. Cependant, il est également reconnu que les gestionnaires et les concepteurs de routes ont une responsabilité significative de fournir un système routier qui protège tous les usagers de la route. Cela peut être réalisé grâce à des conceptions appropriées des routes.
This guide focuses on elements of safe road and roadside designs for road networks that can provide safe mobility to all road users
A substantial reduction in road deaths will only be feasible if concerted efforts are made, following the “Safe System” approach involving all elements of road safety, management, and delivery. This includes all pillars of the Safe System—starting from road safety management, safe roads and roadsides, safe speed, safe vehicles, safe road users, and post-crash care. This guide focuses on elements of safe road and roadside designs for road networks that can provide safe mobility to all road users, as well as complementary changes to improve speeds, vehicle safety, road user behaviors, and post-crash care. A balanced road design must take into account these complementary system elements to maximize safety benefits. The energy carried by a moving object is proportional to the square of its speed. A well-designed “forgiving roadside” ensures that this energy is dispersed in a crash, and as a result, less energy is transferred to the occupants.
Road infrastructure design plays a vital role in road safety outcomes. Safe infrastructure supports other road safety pillars by encouraging appropriate road user behavior (such as appropriate speed and correct lane position) and by providing a forgiving road environment if things go wrong. Poorly designed road infrastructure can give rise to dangerous road user behavior. One of the key realizations of the Safe System approach is that drivers make mistakes and will continue to do so, even if we can reduce how often these occur. This road user error has long been recognized as a significant contributor to poor road safety outcomes. However, roads of any given speed can be designed to reduce the likelihood of crashes occurring, and there is very clear evidence that the severity of outcomes when crashes do occur is significantly influenced by the road design. Even if a crash still occurs, improved road infrastructure can save many lives and prevent debilitating injuries.
The Safe System approach highlights that a shared response is required to address road safety. This means that road users will continue to take responsibility for their actions, for instance by being alert and compliant with road rules. However, it is also recognized that road managers and designers have a significant responsibility to provide a road system that protects all road users. This can be achieved through appropriate designs of roads.