Edit: Wait, this appears to be a different game. A sudden rash of bridge building games? Weird.
Both that one and the one here look like a game I played for free nearly a decade ago. Was a lot of fun, you had the nodes, different materials, and colorized road stress just like these screenshots. Had challenges to make the bridge in less pieces than provided, which would sometimes result in a bridge that would wobble and shake all over but as long as the vehicles passed over you won.