Such bridges typically split the deck into two levels, with road traffic above and rail below. Because a single set of piers supports both routes, they occupy less of the riverbed and cost less in total than two separate structures.

The engineering is harder, though. Repetitive loads from passing trains and irregular loads from road vehicles act on the same structure with different vibration characteristics, making steel volumes and joint design more demanding than for ordinary bridges.

The Yellow River carries a heavy sediment load and its bed shifts. Pier foundations must go deep and be paired with scour protection, which is why substructure work often takes longer than the deck above it.

Luoyang sits at a junction of the central plains, where east–west trunk lines meet north–south corridors. Additional crossings shorten logistics routes for nearby industrial parks and widen commuting catchments.

Henan has begun a series of river-crossing projects in recent years. Completion dates for individual works are routinely adjusted for water levels and the winter freeze.

Hwagyo Sibo reports the state of construction and the method used. Opening dates should be confirmed against official announcements.