> the traditional American crossbuck, the simple X-shaped railroad sign that warns drivers to yield to an oncoming train.
I would guess that roadway signage in the US runs about 80:20 textual:symbolic, but that the EU runs about 20:80, with much heavier use of symbols, and use of text only to modify or explain something not covered by the available symbolic palette. Could any EU->US or US->EU migratory drivers make their own estimates?