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: