Road Crack Detection
Roads, in the country and in the city, are a major public asset, in Australia and in
all countries. To efficiently manage these assets road authorities need accurate,
up-to-date information on the condition of their road networks. Automatic monitoring of
some aspects of road condition, for example roughness and skid resistance, has been
carried out for a number of years. However, one of the most important road quality
indicators, the extent and type of cracking, has up until now been measured only by visual
inspection. The result is that only very sparse sampling has been carried out, at a very
high cost per kilometre, and very little information has therefore been available in this
important aspect of road condition.
The NSW Roads and Traffic Authority (RTA) is responsible for monitoring
and maintaining the condition of roads in NSW. The RTA came to CSIRO for the
solution to the problem of gaining a vast improvement in the
quantity and the quality of information on cracking in roads and highways.
Our solution - the world's first real-time crack detection and
classification system. A specially fitted truck, fitted with powerful lights
and a high-speed digital camera, continuously captures images of the road
(each 500 millimetres by 750 millimetres) as the vehicle travels at speeds
up to 100 kilometres per hour.
The Road Crack vehicle
The vehicle can survey over 500 km in a day; 20,000 km in NSW and 1,500 km in South Australia were
surveyed during the first half of 1998. All cracking greater than 1 mm in width is
detected. All processing is carried out in real time on board the vehicle, so the results
of a day's survey are available as soon as the survey is finished. The benefit is better
road management based on much more detailed information than was available previously.
Detail of image captured by the system
(top) and
detected cracking (bottom)
The plot below shows the kind of output produced by the system. The amount of cracking,
calculated as the number of image frames containing some cracking, is plotted against
distance along the road. Type and width of cracking are not shown in this figure, but this
information is produced also.
Graphical display of a cracking survey
The road crack detection system has received the following
awards:
-
Australian Road Research Board, Transport Research Director's Prize
for "Application of Research into Practice", 1998
-
Institution of Engineers, Sydney Division, Engineering Excellence
Award for Engineering R&D, 1999
-
Institution of Engineers, Sydney Division, Engineering Excellence
Award, Special Commendation for Asset Management, 1999
-
Institution of Engineers, National Engineering Excellence Awards,
AusIndustry Award for Innovation, 1999
-
CSIRO Medal, 1999
For further information contact:
Dr Mark Berman
(phone: +61 2 9325 3205) or
Dr Michael Buckley (phone:
+61 2 9325 3209)
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