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4. California Department of Motor Vehicles. Order to Adopt. Article 3.7: Autonomous Vehicles. http://www.dmv.ca.gov/portal/wcm/connect/d48f347b-8815-458e-9df2-5ded9f208e9e/adopted_txt.pdf?MOD=AJPERES&CONVERT_TO=url&CACHEID=d48f347b-8815-458e-9df2-5ded9f208e9e (accessed April 2015). California Department of Motor Vehicles. Order to Adopt. Article 3.7: Autonomous Vehicles. http://www.dmv.ca.gov/portal/wcm/connect/d48f347b-8815-458e-9df2-5ded9f208e9e/adopted_txt.pdf?MOD=AJPERES&CONVERT_TO=url&CACHEID=d48f347b-8815-458e-9df2-5ded9f208e9e (accessed April 2015).
5. Eye contact as an antecedent to compliant behavior