Adequate sight distance near school exits and entrances is important for safe and efficient traffic operations. If the school site is located on a tangent section of roadway that is relatively flat, then sight distance is typically not an issue. If the site is located along a road with horizontal and/or vertical curvature, then good visibility might be a challenge. An example of this concern is when the queue of vehicles in the parent drop-off zone extends beyond the driveway and vehicles on the adjacent roadway encounter stopped traffic just after rounding a tight horizontal or vertical curve.