The 21st Century Navvy

Whereas in days of yore it would have taken a team of twenty or more workmen plus a steam-roller weeks to lay a tarmacadam road surface, now a single machine (plus a motor roller) can do the job in a day, and the four or five workmen, all of whom apparently have to shave their heads for some obscure reason, watch or lean. You can see where this is from the map!