Evenness is an important index of quality control of high grade highway. Evenness not only influences on highway usage quality, smooth drive and safety, but also on highway environment quality.

Rational small bridge and culvert investigation, design takes important role in reducing construction cost, easy construction and giving a full play to highway usage performance after completion.

Counterpoised traveling bridge-erecting machine is one of the main equipments of the under construction usage of the highway bridge.