Jonas Ihlström


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Research results from Jonas


Split-shift work in relation to stress, health and psychosocial work factors among bus...

BACKGROUND: Shift work has been associated with poor health, sleep and fatigue problems and low satisfaction with working hours. However, one type of shift working, namely split shifts, have received little attention.OBJECTIVE: This study examined...

Cyklisters interaktion med extrautrustning, infrastrukturen och andra trafikanter: En...

How cyclists interact with the infrastructure, and how they integrate the handling of additional tasks, is dependent on the surrounding traffic situation and the cyclists’ characteristics. To study these relationships, a semi-controlled field study...

Kriterier för vägbelysning på statlig väg i och i anslutning till mindre tätorter på...

According to the prevailing road lighting guidelines, roads and streets in urban areas should be equipped with road lighting, while roads outside of urban areas normally do not need to be equipped with road lighting. Vägar och gators utformning...

Factors associated with self-reported driver sleepiness and incidents in city bus drivers

Driver fatigue has received increased attention during recent years and is now considered to be a major contributor to approximately 15-30% of all crashes. However, little is known about fatigue in city bus drivers. It is hypothesized that city bus...

Scenarios for green driving support systems

This work package developed a range of future scenarios with varying degrees of green driver support, considering technological, human and political perspectives. These scenarios will be used in the microsimulation (WP53) and the scaling-up (WP54)....

An on-road study of sleepiness in split shifts among city bus drivers

Bus drivers often work irregular hours or split shifts and their work involves high levels of stress. These factors can lead to severe sleepiness and dangerous driving. This study examined how split shift working affects sleepiness and performance...

Bus drivers working hours and the relationship to driver fatigue

Bus drivers often have irregular working hours like split shifts and their work involve high levels of stress. These factors can lead to severe sleepiness and dangerous driving. The purpose of this study is to highlight how split shifts affect...

Stakeholders’ opinions on a future in-vehicle alcohol detection system for prevention of...

Introduction: There is a common understanding that driving under the influence of alcohol is associated with higher risk of being involved in crashes with injuries and possible fatalities as the outcome. Various countermeasures have therefore from...

Läsbarhet av vägskyltar i form av LED-skylt: färgkombination och fontstorlekens betydelse...

The readability of road signs was studied and in particular the LED format. The purpose of this study was to study the effect of color combination, font size and light conditions on readability. 101 students participated in the study, where 32 were...

Samband mellan hastighet och belysning

The relationship between spontaneous choice of speed and lighting level on streets with stationary light has been studied. On ten streets in Linköping, the speed of cars which were not disturbed by other traffic, was measured. These measurements...

Nykterhetsstödjande system: diskussioner i fokusgrupper

There is a common understanding that driving under the influence of alcohol is associated with higher risk of being involved in crashes with injuries and possible fatalities as outcome. The aim with this study was to understand drivers’ vision of a...

Elektroluminiscent ljus: förstudie avseende tillämpningar för ökad synbarhet hos...

This report deals with the subject of electroluminescent light (EL-light) with regard to its potential application within the road traffic area. A specific focus lies within the visibility of the roadside equipment and the possibility to reinforce...

Vägbanereflektorer: trafikantbeteende, upplevelse och bidrag

The overall aim of this study was to increase the knowledge about road studs’ potential impact on road user behavior, how they are perceived and the possible contribution they make to other road equipment. The study consisted of three parts. Part...

Bussförares arbetstider kopplat till trötthet

Bus drivers often have irregular working hours and their work involve high levels of stress. These factors can lead to severe fatigue and the purpose of this study is to highlight how the working hours affect sleep, stress, fatigue and driving...

Samband mellan vägbelysningsnivå och spontant vald hastighet: förstudie

If something in the road environment is improved, there is always a risk that the drivers will compensate for the better conditions by increasing speed. As an example, one study showed that the introduction of delineator posts in Finland increased...

Tillståndsmätningar av vägmarkeringars funktion år 2012: sammanfattande resultat från...

This report summarizes the results of the condition assessment of road markings in Sweden 2012. The measurements have been carried out using the mobile system Road Marking Tester which mainly is built up of a reflectometer and an optocator. The two...

Symboler i vägbanan: en sammanställning av gällande regelverk i Danmark, Finland, Norge,...

The aim of this study has been to synthesize existing regulations and guiding principles for use of road marking symbols in the Nordic countries Denmark, Finland, Norway and Sweden, together with the Netherlands, Great Britain and Germany....