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In this paper, profile measurement mechanism of a conventional California type profilograph is discussed and a new analytical model to include the non-linear characteristics of the profile sensing mechanism is introduced. A new digital 7.6 m California type profilograph with the combination of a modern sensor, roughness evaluation software, and a wireless LAN is implemented for improvement. The accuracy and repeatability of the new developed profilograph are evaluated. After verifying that the new profilograph has good correlation with the mechanical device, some experimental data from a trial site in Korea are gathered and PrI is automatically calculated on PDA. From trial site experiments and data analyses, the usefulness of the developed device is explained.
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