This is a hard question. An OS kernel alone like Linux is around 28 million lines of code, plus around 30,000 packages available, each with thousands or more L

This is a hard question. An OS kernel alone like Linux is around 28 million lines of code, plus around 30,000 packages available, each with thousands or more LOC. All hand written and interacting. A vehicle might have only a few thousand physical parts, but if you start counting the computing hardware on board you might count transistors on its computers which are now in the billions; plus to be fair you'd count all its software as well.