Safe and future-proof urban infrastructure

For a safe (urban) infrastructure, it is important that roads are properly categorized, have a safe layout and that the desired behaviour is supported. Especially in cities this approach raises problems. In an urban environment many functions (living, working, shopping, games, sports etc.) must be combined, and lack of space, lack of resources or support and factors like spatial structure and design often play a role. This puts the mono-functionality of roads that is desirable from the road safety point of view at risk or is reason to experiment with new types of road design.

Research questions

  1. What are the differences in (the development of) safety levels of the road categories 30 km/hour access road and 50 km/hour distributor road, disaggregated by different levels os design?
  2. Which share of these roads can still be given an inherently (sustainably) safe layout?
  3. It is impossible to give some of the 30 and 50 km/hour roads an inherently (sustainably)  safe layout: money, space, time or public support may for example be lacking. How can these roads still be brought to an acceptable level of safety?
  4. Which SPI is best suited for roads? Are the Sustainable Safety Indicator or VSGS (safe speeds, credible speed limits) suitable SPIs, or is the number of predicted conflicts a good alternative to crash data, as a road safety indicator?

Activities in 2015

This project has a short term objective as well as a long term objective. The long term objective is to find feasible, sustainable road safety solutions for urban roads. In 2015, the short term objective was tackled: insight into the road safety performance of roads with and roads without a sustainably safe layout in urban areas.

The project will be continued in 2016 and SWOV will then focus on the long term objectives.

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Project nr.



Start date: 01 Mar 2015
End date: 31 Dec 2015