Hughes, Warren; Chappell, Debra; Chen, Shyuan-Ren (Clayton) (January 2005). "Geometric Design Treatments". Innovative Intersection Safety Improvement Strategies and Management Practices: A Domestic Scan. Federal Highway Administration. Archived from the original on August 30, 2009. Retrieved August 17, 2013.
Doctor, Mark; Shaw, Jeff; Merritt, George (April 4, 2013). "Intersection and Interchange Geometrics". Every Day Counts 2 Spring Virtual Summits - 21st Century Solutions (PDF). Federal Highway Administration. Retrieved August 17, 2013.
Hall, Jocelyn (September 18, 2015). "M-20 Traffic Restrictions at Leaton Road Starting Sept. 23" (Press release). Michigan Department of Transportation. Retrieved February 4, 2019. Indirect left turns, or Michigan Lefts, near the intersection will be available.
Hughes, Warren; Chappell, Debra; Chen, Shyuan-Ren (Clayton) (January 2005). "Geometric Design Treatments". Innovative Intersection Safety Improvement Strategies and Management Practices: A Domestic Scan. Federal Highway Administration. Archived from the original on August 30, 2009. Retrieved August 17, 2013.