[DCmarcher-976453]

It was spools of fiber optic tubing or gas line lots of spools, lots of heat. Concrete beam supporting roadway essentially blew up from the heat causing the collapse.

[Robert A Cook PE]

Thank you. I understand fiber optic cables underneath the roadway.

[Robert A Cook PE]

https://www.google.com/maps/@33.813385,-84.3662397,3a,75y,13.69h,81.2t/data=!3m7!1e1!3m5!1sUR840_sv2Uxh6E0m6QcsKA!2e0!6s%2F%2Fgeo3.ggpht.com%2Fcbk%3Fpanoid%3DUR840_sv2Uxh6E0m6QcsKA%26output%3Dthumbnail%26cb_client%3Dmaps_sv.tactile.gps%26thumb%3D2%26w%3D203%26h%3D100%26yaw%3D334.15884%26pitch%3D0%26thumbfov%3D100!7i13312!8i6656

Should be a Google maps view of the cables under the bridge.