About "The Cross"

References to ‘the true cross’ in another thread remind me of the following;

I read once that in Roman practice the uprights were permanently left in place, buried in the ground some amount, and a cross-bar was added for crucifictions, perhaps being replaced from time to time (or maybe each time, for all I know)

Consequnetly representations of Christ carrying his (whole) cross through the streets are wrong; he would have just been carrying the cross-member.

Does anyone have information substantiating or contradicting this description of crucifiction crosses?

We’ve had various discussions on this topic.

A sidebar discussion that begins here in an ancient thread discusses one set of theories. A further comment was posted here.

There is also this web site (which appears to be well documented, although I am not sufficiently familiar with its sources to attest to its accuracy).