High mast lighting should not be installed in areas where light trespass is an issue. This is generally areas where residential development is located directly along the highway right-of-way and pole placement is limited to the outside of the roadway. Special high mast designs should be considered to avoid light trespass, if high mast lighting must be employed. See "Glare and Sky Glow Issues" in the next section of this chapter for more information on light trespass.