State of the art; Automatisk sprickmätning av vägbanor


The need for objective collection of crack information has increased in Sweden. The type of wear of the road surfaces has changed. New, more stronger and long lasting pavements have been developed. The use of lightweight studs has also changed the degree of wear. The use of thin pavements increases and the designed life expectation has grown. The amount of heavy traffic increases and maximum allowed axle load, as well as maximum allowed tire pressure increases. All this leads to a change from the traditional measures like rut depth to more adequate measures like crack information. In USA, Japan and south of Europe there is a tradition in inventory of cracks. That is the reason why so many of the existing crack measuring systems has their origin here. The first automatic systems were actually half automatic, they collected pictures of the surface and in a post process the pictures was subjectively judged to describe cracks. The judgment to classify consists of two phases, severity level and degree of seriousness. This manually inspection is a time consuming process and has a low level of repeatability. The first semiautomatic systems used film that had to be developed. This is still used but the technique to acquire films has improved and continues to improve. There are mainly three types of techniques that are used to day, namely:

1. Traditional video (analogue and digital)

2. Line scan video (analogue and digital)

3. Distance measuring laser cameras (point or line scan)

As examples of the three different techniques the following systems can be mentioned: 1: PAVUE/Laser RST and WiseCrax (ARAN), 2: HARRIS, 3: G.I.E. Laser Vision and Laser RST.

To get a complete automatic crack-measuring system there is also a need for an automatic classification and judgment. This is still the most difficult part to achieve. A lot of processor power and a well functioning classification model are needed to do this. To reduce the amount of data it would be an advantage to do this in real time.  



Millions for research into maritime transport and the environment

Maritime transport is a major source of emissions of harmful air pollutants and carbon dioxide. In a new project, a research team from the Swedish National Road and Transport Research Institute (VTI) and the University of Gothenburg has received SEK 6.4...


New research programme for more efficient travel

The Swedish National Road and Transport Research Institute (VTI) is playing an important role in a major new research programme to find radical solutions leading to fewer trips and more efficient travel, along with tools to enable better use of roads and...


Simulator used to practice emergency responses safely

Emergency responses of the police, ambulance, and rescue services are associated with a high risk of accidents, but practicing them in real traffic is neither safe nor permissible. A simulator-based method developed by the Swedish National Road and Transport...


Simulation of cut-in by manually driven vehicles in platooning scenarios

A study in a VTI-driving simulator has showed that a platoon will be able to handle a cut in from a manually driven car. The results of this study have recently been presented at two conferences in Japan.



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.


Self-driving buses in Sweden next year?

A self-driving, fossil-free bus. This idea might become reality through a forthcoming collaborative project involving the Swedish National Road and Transport Research Institute (VTI), Linköping University and several other participants. The project group aim...