AASHTO MASH-2, Manual for Assessing Safety Hardware, Second Edition (2016), sets out uniform procedures for testing and evaluating roadside safety features. Chapter 1 introduces the manual, and Chapter 2 presents the test matrices and conditions that govern which tests a device must undergo. Chapter 3 covers test installation, Chapter 4 specifies test vehicles, and Chapter 5 gives the test evaluation criteria applied to performance. Test documentation requirements appear in Chapter 6, and Chapter 7 addresses in-service performance evaluation. The manual is intended to encourage consistency in the testing and evaluation of roadside safety hardware, so that results from different laboratories and agencies can be compared. It is used by hardware developers, testing laboratories, and highway agencies that approve roadside safety features.