ABSTRACT
Daily on-road inspection of Hanshin Expressway is carried out by inspectors in a patrol car running at lower speed than regular vehicles; they rely upon eyesight and upon bodily sensation. There are, however, problems that the inspectors’ concentration does not last long; that the oversights are unavailable; and that it is difficult for the inspectors to have accurate records. Hanshin Expressway Engineering, therefore, developed a measurement car and a data processing unit that the collected data can be viewed and analyzed conveniently.
The on-board devices of the measurement car provide accurate measurements and high resolution images. Surface unevenness, IRI, and joint bump can be determined from the 3-meter profile meter output.
Rut measurement data provides maximum and average rut depth values. Pavement cracks can be observed by the high resolution image of downward-looking line-scan camera.
As a result, three important measurements of pavement (unevenness, ruts, and cracks) have been made possible by the measurement car.
To simplify the synthetic evaluation of collected data, the authors developed the viewer apparatus that can integrate the collected data and that can show those on one screen as shown in Figure 1. Screen image of viewer apparatus integrating data collected. https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781315207681/cd556cd4-4dcf-4efe-8e29-56fc67b8bfbd/content/fig315_1.tif"/>
Furthermore, the test operation of the measurement car has demonstrated the followings: 1) joint damage can be detected by using the downward-looking line-scan camera output; 2) damage in railing walls and noise barriers can be detected by using the sideward-looking line-scan camera output.
