↑ Lopatto, Elizabeth (December 19, 2018). "I took a ride through Elon Musk's new tunnel in California". สืบค้นเมื่อ December 19, 2018. top speed is 40 miles per hour … 1.14 mile tunnel … one-mile test tunnel … year and a half to complete, … about $10 million, not counting research and development
↑ Shadbehr, Arnold; Miyahira, Russ (August 22, 2017). Agenda Item No. 6 (รายงาน). Agenda Bill. City of Hawthorne City Council. p. 42. http://hawthorne-ca.granicus.com/MetaViewer.php?view_id=&event_id=465&meta_id=32264. "strip of land 15 ฟุต (4.6 เมตร) wide … beginning of a non-tangent curve concave south westerly and having a radius of 530.00 ฟุต (161.5 เมตร) … 13.56 ฟุต (4 เมตร) southerly of the 120th Street centerline … thence tangent to said curve … parallel with and distant southerly a distance of 7,721.21 ฟุต (2,350 เมตร) to a point of terminus"
