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


25-26
Apr

Cost Benefit Analysis (CBA) workshop in Stockholm

An open seminar and workshop in Stockholm will be held on 25-26 April 2018. The workshop deals with the use of CBA as a basis for decision-making in the public sector. The workshop is organized by, among others, Professor Jan-Eric Nilsson, VTI.
13-14
Jun

The 6st Humanist Conference

The 6th HUMANIST Conference will take place 13-14 June 2018 in the Hague, The Netherlands. The scope of the conference covers a wide range of topics on Human Factors in Transport. Tania Willstrand and Alexander Eriksson will present their research results.

LATEST NEWS


2018-04-17

VTI will develop simulators for ambulance staff

VTI has initiated a pilot study for paramedics with the Centre for Teaching & Research in Disaster Medicine and Traumatology and Linköping University. The aim is to give ambulance staff the opportunity to practice critical medical tasks in a moving vehicle in...


2018-04-12

Unique electrified road opens in Sweden

The world’s first electrified road recharging the batteries of cars and trucks while driving opened in Sweden. The Swedish Minister for Infrastructure, Tomas Eneroth, was at the formal inauguration of the electrified road on April 11, 2018. VTI is one of 22...


2018-04-11

Swedish road safety spreads internationally

Sweden is a leading country in terms of road safety, and the research conducted by the Swedish National Road and Transport Research Institute (VTI) has contributed to increased safety. VTI’s remit includes disseminating research results and keeping up to date...


2018-04-06

A greater understanding of cyclists' behaviour

Cyclists are often accused of not following traffic rules and being hooligans on the road. New research shows that there is no support for this perception. "Our observations reveal no such general anarchy" says Sonja Forward, researcher at VTI.


2018-03-28

New technology for road surface measurement tested

VTI has tested a new scanning-laser technology for road surface measurement. The tests show the new technology for comprehensive transverse-profile measurement provides dependable values in measuring transverse profile and rut depth.


2018-03-15

Ulf Sandberg has been presented with the TTI Lifetime Achievement Award 2018

VTI’s Senior Research Leader Ulf Sandberg has been presented with the TTI Lifetime Achievement Award 2018 for his work on research into tyres and road surface.