"This informational report explores the history of corner visibility guidelines@ compiles and compares the intersection corner visibility policies and practices in place in the United States and in certain foreign countries@ and addresses whether policy consistency on the topic exists. The Technical Council Committee conducted an in-depth listserv/MuniCode search using ""Sight Triangles""@ ""Corner Clearance""@ ""Intersection Sight Distance""@ and other associated terms. In addition@ committee members obtained municipal@ local@ and state government codes@ policies@ guidelines and handbooks related to intersection or driveway sight distance triangle regulations. A random sample of 85 guidelines from this extensive body of research (more than 850 were collected) was summarized in a database in order to identify recurring methods and requirements."