Overweight/overdimension (OW/OD) trucking is an important and growing segment of the trucking industry, especially in Western Canada. However, some provincial and municipal policies governing OW/OD trucking are not rational or consistent, due in part ot the lack of available information. This thesis consolidates existing Western Canadian OW/OD policy information and presents new information on the extent and characteristics of OW/OD trucking in order to assist OW/OD policy makers in making better policy decisions. The new information is generated from the Manitoba Highways truck weight survey data base and by sampling internal government files. In addition, a comparative engineering and administrative evaluation of selected Western Canadian OW/OD policies is made, with specific recommendations for improvement to Manitoba OW/OD policy.