Mammoet skidding system used to replace 10,000-ton bridge in under 24 hours

Time was a critical factor when crews had to replace the Pittsburgh Commercial Street bridge — a main route in the busy city that’s used by more than 100,000 vehicles every day. ​ Time was a critical factor when crews had to replace the Pittsburgh Commercial Street bridge — a main route in the busy city that’s used by more than 100,000 vehicles every day.