From the Abstract: "This report presents the best practices in Intelligent Transportation Systems Cybersecurity, particularly in the planning and conducting a Penetration Test. The report details the methodology of scoping a test; including the objectives, requirements, success criteria, test type, management, and test readiness. The report is completed with a template test plan to start local and state DoT's [Department of Transportation's] in their own cyber security plan and penetration test."
FHWA-JPO-19-763; Federal Highway Administration-Joint Program Office-19-763
National Transportation Library: https://rosap.ntl.bts.gov/