The "ECE R66" designation refers to the international safety standard for roof strength, and this mod reflects that sturdy, premium build.
The term refers to a specific level of structural integrity or a reference standard used by bus body manufacturers. While not a universal ISO term, in the context of bus manufacturing (particularly in Asian and European body-on-chassis builders), SR stands for Structural Reference . sr2 ece r66 bus skin
Note: This write-up is based on the typical interpretation of ECE R66 design principles applied to a generic SR2 bus model. If you have specific screenshots or details about a particular file, I can adjust the description further. The "ECE R66" designation refers to the international