Compared to giant structures like the Mackinac Bridge, the bridge carrying I-75 over the Sexton and Kilfoil Drain in Allen Park wouldn’t seem to be all that impressive.
But appearances can be deceiving. It’s what’s inside the bridge–or more precisely, what’s inside its reinforced pres tressed bulb-T sections—that really counts.
Because what’s inside them isn’t the usual steel reinforcing bars. Instead, there are innovative strands made of continuous carbon fiber, which is far lighter than steel and far more durable, because it doesn’t corrode.