Note the asphalt that has been scraped away. Were we prone to spewing post-modern drivel, we might utter something melodramatic like, "notice the thin veneer of modernity blanketting the ruins of the collective past that we so quickly forget!" Then we'd make a crack about the quick rise and fall of the automobile as an efficient means of tranport in the ever-increasing density of the city --and how we can look to the past to save us in the future. Oh, History!
It's a neat article with several photos. I drive within a block of this bridge every morning and work about a mile away from it. The last two are really classic archaeology pictures showing features beneath a removed stratum. Appears as if they just scraped and repaved, so it's all still preserved underneath.