English to Japanese Tech/Engineering Construction / Civil Engineering 高速道路工事

This area covered a 4.5-kilometer (2.8-mile) stretch of badly damaged concrete lanes. It was rebuilt in only *two single-roadbed continuous closures* (also called “extended closures”) totaling 210 hours, using counterflow traffic (opposite direction to the main traffic flow) and 24-hour-per-day construction operations.
http://www.ops.fhwa.dot.gov/publications/fhwahop12009/sec7.h...