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If it was a good idea to leave the road open while post-tensioning single truss members is questionable. From my point of view there was no reason to close the road on account of a crack that was judged as not dangerous by an experienced engineer. These decisions are not made thoughtlessly. You would check the analysis, look into reinforcement and post-tensioning drawings, try to find the reason for the crack and find out the crack's influence on the load carrying ability. I don't know of any non-destructive testing to proof harmlessness of cracks. But I'm retired for 10 years now. You can find rebars, crack planes, but how and if the cracked structure carries the loads still remains the judgement of an engineer. For the proof you expect you have to cut out the cracked area and test it in a laboratory. That is why I said, for judging cracks you need knowledge and a lot of experience. Regards, Volker
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