It seems that most bridge are composed of concrete, e.g in Latvia
However, concrete encompases a lot of bridge types:
Most concretes used are lime-based concretes such as Portland cement concrete or concretes made with other hydraulic cements, such as ciment fondu. However, asphalt concrete, which is frequently used for road surfaces, is also a type of concrete, where the cement material is bitumen, and polymer concretes are sometimes used where the cementing material is a polymer.
Which concrete material do modern civil engineers prefer when designing bridges over motrways less than 30 meters above the underpass?