The subject backs to a major highway and has a 40' sound barrier wall between the back yard and the highway. I want to make a an adjustment reflecting this less than desirable feature. I believe this is considered exterior obsolescence and want to adjust the subjects site on the sales grid. Do I list the subject site as average and the comps that dont back to highway as supeior or do I list the subject site as inferior and the comps as average. I know this is a pretty basic question but there you have it. Thanks to all that reply.