Åsa Forsman


Picture of Åsa Forsman

Research results from Åsa


Traffic safety effects of new speed limits in Sweden

Driving speeds affect the risk of being involved in a crash and the injury severity as well as the noise and exhaust emissions. Starting 2008, the Swedish Transport Administration performed a review of the speed limits on the national rural road...

Tunga lastbilars däckanvändning och olycksrisk vintertid

In Sweden, it is today regulated that winter tyres must be used on the drive axle of heavy vehicles (total weight in excess of 3,500 kg) during the winter season period, December 1 to March 31, in case of winter conditions. This requirement is based...

Changes in speed distribution: Applying aggregated safety effect models to individual...

This study investigated the effect of applying two aggregated models (the Power model and the Exponential model) to individual vehicle speeds instead of mean speeds. This is of particular interest when the measure introduced affects different parts...

Cyklisters hastigheter: Kartläggning, mätningar och observation

Many different road users share space on pedestrian and cycle paths, and their speeds may differ greatly. Differences in speed can complicate the interactions between road users which in turn may cause incidents and accidents. The purpose of this...

Design and analysis of semi-controlled studies

Semi-controlled studies provide a hybrid approach in between controlled experiments and naturalistic driving studies. As in controlled experiments, the researcher can assign participants to groups, select the route and define the tasks, but the...

Prognosintervall för antal allvarligt skadade i vägtrafikolyckor

The number of seriously injured road users is used both as an indicator of traffic safety trends in Sweden and in more specific studies of, for example, different road user groups. A seriously injured person is defined as a person who suffers...

Utvärdering av alkolås efter rattfylleri: enkätstudie

A permanent alcohol interlock program for drink drivers came into force on 1 January 2012. The Swedish Transport Agency is responsible for the program that applies to all types of driver's licenses. The program includes both a one-year and a...

Traffic safety effects of new speed limits in Sweden

The effects of speed, both positive and negative, make speed a primary target for policy action. Driving speeds affect the risk of being involved in a crash and the injury severity as well as the noise and exhaust emissions. Starting 2008, the...

Participation Rates in a Voluntary Alcohol Interlock Program for Drink Drivers in Sweden

After a long trial period, an alcohol interlock program was permanently introduced in Sweden in 2012. Participation in the program is voluntary and the duration of the program is one or two years, depending on the severity of the drink driving...

Alkohol, droger och läkemedel hos omkomna personbilsförare: år 2005–2013

It is well known that drunk drivers constitute a large traffic safety problem and a number of Swedish studies have been conducted about this group of drivers. Much less is known about drivers that are impaired by drugs or medicines and the aim of...

Evaluation of New Speed Limits in Sweden: A Sample Survey

The study sought to estimate changes in actual driving speed occurring after new speed limits were introduced in Sweden’s rural road network. The effects of speed limit changes were estimated for 7 groups of roads of different types and initial...

Skadade motorcyklister: en analys av var i vägnätet som motorcyklister skadas och...

The main aim of the study was to examine where on the road network motorcyclists are injured. Accidents involving four-wheelers (ATVs, quad bikes) have also been studied, although to a lesser degree. The study is based on police reported injury...

Speed distribution and traffic safety measures

A main  traffic  safety  priority in  many  countries  is  implementing measures  that reduce  road  user  speed  and increase  speed limit compliance. This study compares changes in the  speed distribution  and estimated accident risk brought about...

Riskkurva för alkohol: studie baserad på omkomna personbilsförare i Sverige

The risk of a driver to be killed or injured in a crash increases considerably under the influence of alcohol. The risk increases with increased alcohol concentration. In this study, a risk curve for car drivers representing Swedish conditions has...

Speed management in Sweden: evaluation of a new speed limit system

Between 2008 and 2011, the Swedish Transport Administration reviewed the speed limits on the state rural road network in Sweden. Guidelines were established for different types of roads, and the long-term vision was that speed limits should be...

Alcohol- and drug-related fatal accidents in Sweden: where do they occur?

This conference paper presents an accident study investigating where fatal alcohol- and drug-related accidents occur with respect to traffic environment (i.e., urban versus rural), road type, speed limit, annual average daily traffic flow, and road...

Hastighetsspridning och trafiksäkerhet

This study describes the state of knowledge in terms of speed distribution and traffic safety. Real changes in speed-distribution and estimated accident risk for three different traffic safety measures are studied. The aim is to gain a better...

Effects of d-amphetamine on simulated driving performance before and after sleep...

Stimulant drugs are commonly abused and also used to promote wakefulness, yet their effects on driving performance during sleep deprivation have not been thoroughly researched in experimental studies. The aims were to assess the effects on...

Traffic safety and economic fluctuation: long-term and short-term analyses and a...

In studies of traffic safety is it important to have good knowledge of both internal and external factors. Examples of the former are driver behaviour and the roads’ safety standard, while examples of the latter are the demographic structure and the...

Analys av rattfylleriolyckor: var och när sker olyckorna?

Minor roads shouldn’t be left unattended by the police when surveying drink-driving and extensive surveillance is needed during nighttime. These are the main conclusions of a VTI study concerning where and when alcohol-related traffic accidents...

Utvärdering av nya hastighetsgränssystemet: effekter på hastighet, etapp 2

Starting 2008, the Swedish Transport Administration performs a review of the speed limits on the state rural road network in Sweden. This study presents results from speed measurements made before and after the changes of speed limits in Phase 2...

Utvärdering av nya hastighetsgränssystemet: effekter på trafiksäkerhet och miljö

The Swedish Transport Administration estimated prior to the speed limit review that an increased or reduced speed limit of 10 km/h would result in an actual increase or decrease of 4 km/h for passenger vehicles. The change for heavy goods vehicles...

Förekomst av droger och läkemedel i trafik i Sverige: resultat från EU-projektet DRUID

The prevalence of illicit drugs and medicines in the driving population, i.e. among drivers on the road, was 2.5 per cent between the years 2006 and 2011 in Sweden. The prevalence of alcohol, illicit drugs and medicines among drivers killed in...

Trafiksäkerhet och konjunktur: modellansatser och litteraturstudie

This project includes two subprojects. The objective of the first subproject has been to investigate which types of accidents are most sensitive to the state of the market and which road user groups are involved. The objective of the second...

Co-operation between police and social treatment services offering treatment to drink and...

Objective: To describe and analyze a measure that has been introduced in Sweden with the objective of quickly offering treatment for the alcohol or drug problems suspected drink or drug drivers may have. The goal of the measure is that every...

Results from the analysis and input to the development and validation of the statistical...

The aim of Deliverable 5.1 of the ITERATE project is to present results of analyses made of the data collected in the ITERATE WP4 driving simulator experiments. The ITERATE WP4 driving simulator experiments consisted of train and car driving...

Results from the analysis and input to the development and validation of the statistical...

The aim of Deliverable 5.1 of the ITERATE project is to present results of analyses made of the data collected in the ITERATE WP4 driving simulator experiments. The ITERATE WP4 driving simulator experiments consisted of train and car driving...

Sleepiness and prediction of driver impairment in simulator studies using a Cox...

Cox proportional hazard models were used to study relationships between the event that a driver is leaving the lane caused by sleepiness and different indicators of sleepiness. In order to elucidate different indicators' performance, five different...

Impact of Nonresponse and Weighting in a Swedish Survey

Results from travel surveys, together with traffic monitoring programs, serve as a basis for policy decisions and evaluations. Correct interpretation of the survey results is therefore of vital importance, and the impact of different sources of...

Child safety in cars: Literature review

In order to study child safety in cars, international literature was reviewed with respect to road vehicle transportation for children, with the focus being on the age up to 12 years. The review included literature in English and Swedish....

Barn i bil - socioekonomiska faktorer: litteratur- och enkätstudie

The aim of the study was to identify relationships between no use/misuse of safety belt/child restraints and socio-economic aspects. The conclusions from the study will provide a basis for the future development of information and campaigns to...

Krockkuddar i bilen: konflikt mellan barns och vuxnas säkerhet?

Parents who transport their children in passenger vehicles have to face several questions of how to restrain the child properly and where to place the child. It is difficult to give unambiguous answers to these questions since a number of factors...