EuroRAP maps give various insights into risk and can be used to support the differing needs and levels of expertise of road safety stakeholders. Under EuroRAP’s Risk Mapping protocol, safety indicators based on the road network, crash numbers and traffic flow can be used to produce mapping showing:
- Crashes per kilometre used by road authorities to reflect more broadly how the total risk to all road-users is distributed across a network;
- Crashes per vehicle kilometre travelled showing the risk to individual road users as they move around a network;
- Risk in relation to roads with similar flow levels;
- Economic potential for crash reduction showing the opportunity for investment from Safer Road Investment Plans.
To bring the data in line to a European norm, different thresholds for each risk rate banding (low, low-medium, medium, medium-high, high) are used. This adjustment is based on the ratio of the number of fatal accidents to the number of serious accidents
The aim of this adjustment is not to change one country’s accident reporting practice to fit that of another, nor is it to artificially increase or reduce rates in any country. The adjustment simply gives a better estimate of relative long term accident rate for each link within a national network.
Where material included on the site has not been subject to this adjustment, and therefore, where it cannot be compared directly with other countries, this is clearly marked.
Some short sections of road (e.g. link roads), and some that carry low traffic volumes are removed from the sample. These short sections (e.g. less than 5km), those that have small accident totals (e.g. less than 7), or carry low traffic volumes (e.g. less than 3,000 per day) are more likely than others to experience greater year-to-year variation in accident rate and are therefore more likely to change risk rating from one period to another.
For more detailed information on the criteria and methodology used, refer to the following Technical Reports:
The next set of Risk Bands have therefore been defined in the Decade to 2020 by halving the thresholds for Risk Bands 2010.