Abstract
Roughness of the road surface was evaluated by means of driver's systolic blood pressure change and its allowable limit was obtained. The systolic blood pressure increased rapidly more than 40mmHg as driving on the road where the surface roughness of ±7.5cm in height ×60〜90cm in length covers approximately 60% of the entire road length. This value of surface roughness should be considered as the criterion of allowable limit in repairing and maintaining forest road surfaces from the view point of the driver's psychological and physiological responses.
