Infrastructure:

From Derek Van Bever: "I know that this is not strictly auto-related, but I am obsessed by these driveway markers where the construction companies of old would place their mark on their work."

AL: there has to be a noun for these things and no doubt an entire subculture. I think one of the first construction contracts my grandfather took on was building sidewalks for Medicine Hat, Alberta, c. 1910.

I wonder if there are any Northern Construction Co. markers still extant?

Now AL has caught the bug: