1.1 This practice covers certified, tested, commercial type, EMSS ambulances built on chassis that are suitable for the intended application and meet the requirements herein. The ambulances are front or rear wheel driven (4x2) or four whe This practice covers certified, tested, commercial type, EMSS ambulances built on chassis that are suitable for the intended application and meet the requirements herein, it also covers the design, construction, and procurement of emergency medical ser