CONTENTS 



Page 



INTRODUCTION 1 



Skidding and Yarding Studies 2 



Forest Road Studies 2 



OPTIMUM ROAD SPACINGS FOR HARVESTING 3 



Example of Use 10 



CONCLUSIONS 12 



LITERATURE CITED 13 



ABSTRACT 



Describes development of a model that can be used to optimize the spacing 

 of work roads used primarily or exclusively for logging. Past methods have 

 not included enough of the variables influencing cost. Road costs associated 

 with the effects of variables of slope and difficulty of construction (primarily 

 percentage of rock in the excavation) have not been included. 



All direct costs associated with roads, landings, skidding, and yarding 

 are included in the model to insure true economic optimization of road and 

 landing spacings. 



