In some European countries there is a growing tendency to use concentrated tendons for the construction of post-tensioned concrete bridge deck beams. These tendons have proved most suitable for long-span bridges with heavy traffic loads where large prestressing forces are involved. They also show some special advantages for the prestressing of skew and curved decks. A concentrated tendon will reduce the prestressing cable's cross-sectional area to the absolute minimum, thus ensuring that the post-tensioning duct will take up as little a percentage of the cross-sectional area of the beam as possible. This is achieved by concentrating all the needed prestressing steel in a single, usually rectangular, sheet-metal duct. The steel (wire or strand) is arranged one above the other in a number of horizontal layers. Comb-like spacers are used to keep the wires the correct distance apart. There are some impressive advantages to be gained from the use of concentrated tendons. Cable installation is much simpler. Mechanical equipment for laying, tensioning and grouting can be used rapidly and more efficiently and because the tendon takes up only a small amount of space in the beam, concreting is correspondingly simplified. A stiff vibrated mix with larger sized aggregates can be used. This should mean a higher strength concrete with less shrinkage and creep than if a wetter mix is used.