Originally Posted by Martian

Dozers don't have roll cages as such, since they're typically too large for them to be of any use. They do typically have an awning or cage which is more to protect the operator from any debris than anything else. I would estimate a machine of that size to weigh somewhere in the 10 to 15 ton range, so a functional rollcage would have to be so bulky as to be totally impractical. Note the size of the crane being used to lift the machine.