Thomas Lundberg


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Research results from Thomas


MPD and IRI in the position of large goods vehicles

Monitoring of the state road network in Sweden includes the longitudinal measurements of International Roughness Index (IRI) and Mean Profile Depth (MPD). This data can be used to predict values associated with rolling resistance, comfort and...

Safe accessibility

In this project, rut depth development studies were carried out on road sections subjected to three specific types of traffic safety measure. The measures, implemented through the Swedish Transport Administration’s "Safe accessibility" project,...

Safe accessibility

This report consolidates evaluations performed within the project “Safe accessibility” on behalf of the Swedish Transport Administration. Four different measures implemented on rural roads in Sweden with the aim to increase traffic safety and...

Objective measurement method for assessment of gravel road condition

Condition ratings on the gravel road network are of today made subjectively according to the Swedish Transport Administration’s current method description. This project aims to develop a reliable, objective and mobile methodology for continuous...

Swedish road condition indicators; past, present and future

On behalf of the Swedish Road Transport Administration, VTI has developed and proposed new indices of road surface measurement that better describe damaged or badly constructed road sections. The indices have been developed using data that is...

MPD/IRI Transverse Position

Road monitoring of the state road network in Sweden includes for the longitudinal measurement of international roughness index (IRI) and mean profile depth (MPD). In Sweden the paths of the longitudinal measurements correspond to the surface contact...

The potential to identify low friction from macrotexture

The Swedish Transport Administration want to describe the friction condition of the entire national road network. A nationwide friction measurement is practically difficult to manage and very costly, while we are already measuring road surface...

Travel comfort on winter roads

What can be stated in this project is how a winter road is experienced when compared to snow free conditions, primarily with regard to unevenness and noise. Surveys carried out during the project show that it is possible, without too much...

Prognostic models for the road condition indices in the Swedish Transport...

In Sweden, the road surface condition is assessed regularly with laser-based profilographs. This has been done since 1987. All roads are, for financial reasons, not assessed every year, but one way to describe the condition of the entire road...

Prognostic models for the condition indices in the Swedish Transport Administration's...

In Sweden, the road surface condition is assessed regularly with laser-based profilo-graphs. This has been done since 1987. The purpose of these assessments is to provide the Swedish Transport Administration’s Pavement Management System (PMS) with...

The influence of lateral position when measuring road surface characteristic data

In conjunction with development of rolling resistance models it has been brought up to date that the knowledge of the size of variation of road surface characteristics data across a road section is not well known.In a rather limited VTI study it was...

Swedish road condition indicators; past, present and future

The Swedish paved road network is, on a yearly basis, monitored by road surface testers in order to supply the road administration with objective condition data .The data is used to measure how well the decided road condition standard is achieved...

Road surface texture and its variation

Early fault detection, particularly at construction stage, can result in substantial savings for the Swedish Transport Administration. A contributing element to these savings is to have a homogeneous bituminous surface structure. For example, load...