Comparative analysis of safety performance measures for hotspot identification: a case study of Brazilian urban areas

Vanessa Jamille Mesquita Xavier
Flávio José Craveiro Cunto

The overall effectiveness of the roadway safety management process (RSMP) relies on a robust method for identifying and ranking sites with major potential for safety improvements. In Brazil, manuals for hotspot identification are usually based only on crash frequency and crash rate as safety performance measures. The Highway Safety Manual (HSM) proposes 13 performance measures for hotspot identification which require different levels of completeness and accuracy of accident data systems as well as different modeling skills from safety staff. Therefore, it is common that jurisdictions in the infant stage of the RSMP would apply less informative safety PMs. This study presents a comparative analysis of safety performance measured taking into account its limitations applicability to a sample of signalized intersections from Fortaleza city, Brazil. Crash data as well as traffic and geometric attributes for the year of 2010 were used to estimate safety performance measures including those involving the development and application of safety performance functions. The performance of each measure to rank the sample intersection was achieved through the rank difference between each PM and the excess expected average crash frequency with EB adjustment (EEB). The consistency of each intersection within the top 20 most dangerous sites was also evaluated using a total seven performance measures. The results have suggested a reasonable matching between the most comprehensive performance measure (EEB) and very simple PMs such as crash frequency and crash rate. It is recommended to investigate the consistency of the results for longer observation period as well as for a different jurisdiction in Brazil. The results are also expected to contribute to the safety modeling community in Brazil and to bring better prospects for economic return considering the scarcity of resources applied to safety studies.

MEET US


19-20
Oct

ERPUG 2017

The five year anniversary of  European Road Profile Users' Group (ERPUG) Forum will take place at Ramboll head quarter, Copenhagen, Denmark October 19-20, 2017. 

LATEST NEWS


2017-07-05

Vehicle Driver Monitoring: sleepiness and cognitive load

To prevent road crashes it is important to understand driver related contributing factors, which have been suggested to be the critical reason in 94 per cent of crashes. The overall aim of the project Vehicle Driver Monitoring has been to advance the...


2017-06-29

Tomas Svensson new director-general

Tomas Svensson was today appointed Director-General of VTI. Tomas has been acting Director-General since January 2017. 


2017-05-30

Crash testing bicycles at VTI

For the first time single bicycle crashes have been simulated at the VTI crash safety laboratory.


2017-05-15

A case study exploring firefighters’ and municipal officials’ preparedness for electrical vehicles

A VTI-study presents a social perspective on new vehicle technology. It explores the self-reported preparedness of the fire departments (i.e., rescue services) in Sweden’s three largest cities regarding rescue operations involving electrical vehicles (EVs).


2017-05-02

Pioneering research on and about bicycles at VTI

Under what circumstances might cyclists lose tyre grip? What actions could then be taken to prevent a crash? VTI is currently developing a theoretical model of the behaviour of bicycle tyres during braking and steering in different situations and on different...


2017-05-02

Virtual pedestrians create efficient stations

If more people are to choose sustainable travel, then the public transport stations of the future must be designed so that pedestrians can get where they are going quickly, without congestion or queues. The Swedish Road and Transport Research Institute (VTI)...