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How are freeway bridges built?
After calculating the anticipated traffic for the bridge, cement/reinforcedwithrebar stanchions are spaced over the freeway to accommodate the bridge.
An 'off-ramp' from the freeway to the bridge is constructed, as is an 'on-ramp' to the subsequent road.
Cement/rebar slabs are built and lifted with cranes to form the platform, and voila! Drive carefully.
Although the bridge deck/roadway is almost always a concrete slab, the structure that holds up the bridge deck can be reinforced concrete, structural steel, or a combination of steel and concrete.
An 'off-ramp' from the freeway to the bridge is constructed, as is an 'on-ramp' to the subsequent road.
Cement/rebar slabs are built and lifted with cranes to form the platform, and voila! Drive carefully.
Although the bridge deck/roadway is almost always a concrete slab, the structure that holds up the bridge deck can be reinforced concrete, structural steel, or a combination of steel and concrete.