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Turbos on diesels don't glow red anymore. 15 years ago when NOx output was barely regulated, they did. 1200F EGT, no problem. Modern de-NOxed diesels with high EGR flow (30-50% of the intake charge) can barely make 800F EGT.
That being said, I wouldn't recommend shutting it down at red lights. Modern diesels need to keep heat in their aftertreatment systems. It's not like a gas engine that will merely pollute more if the cat cools down too much. A diesel will get constipated pretty quick if proper aftertreatment temps are not maintained.
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