A study of safety effects of road infrastructure improvements under Israeli conditions

Download
Victoria Gitelman

A study aimed at developing a uniform methodology for evaluating potential safety effects of projects on road infrastructure improvements is presented. The final product of the study is a computer program, which enables its users to perform cost-benefit analysis of different variants of a project, from the viewpoint of associated accident savings, and serves as an assistance tool for road and traffic engineers. The core element of the system is a database on values of expected safety effects from various road infrastructure improvements. To provide this database, the study included the following steps: (a) developing a summary of safety effects as these appear in the international experience (based on reviews on the subject published over the last decade, some 250 summary values were evolved); (b) developing a method for evaluating safety effects of road infrastructure improvements under local conditions; (c) collecting data on road infrastructure improvements performed on the Israeli road network through the 90s and building examples of treatment types for analysis (in total, some 400 interurban and some 500 urban projects were recorded in the database from which more than 30 examples of treatment types evolved); (d) evaluating the effects of these treatments, based on accident statistics in "after" as opposed to "before" periods. Based on the comparative review of the known methods for evaluating safety effects, the method proposed in the current study accounts for confounding factors such as regression-to-the-mean, time-trend, changes in traffic volumes but at the same time, stays relatively simple and accessible for wide application. To combine the study findings with the previous experience, decision rules were developed which enabled the inclusion of some 20 estimates of safety effects in local conditions, to the required database.

MEET US


6
Oct

Open seminar with Mistra SAMS international scientific advisory...

Mistra SAMS international scientific advisory panel (ISAP) is visiting Stockholm, and the program will host an open seminar where the panel members will give talks in their area of expertise.
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)...