Sayers, Michael. <br/><br/>
The international road roughness experiment: Establishing correlation and a calibration for measurements. 

 - Washington :  World Bank,  1986. 
<br/><br/> This paper is an experiment on road roughness. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Roads.<br/>Road -- Measurements.--Road -- Measurements.