In the way of stitching, it is a normal practice to construct widening part of a bridge at first and let it stay undisturbed for numerous months. After that concreting will then be approved out for stitch between existing deck and new deck. In this way, dead load of a widened part of bridge is supported by itself and loads arising from newly constructed deck will not be transferred to existing deck which is not designed to take up these additional loads.

One of the core concerns is an effect of stress induced by reduction of just now widened part of bridge on existing bridge. To address the problem, widened part of bridge is constructed a period of time as in 6 to 9 months ,prior to stitching to existing bridge so the shrinkage of a new bridge will take position within this period and effect of shrinkage stress exerted on new bridge is decreased.

Traffic shaking on existing bridge causes undesirable effect to freshly placed stitches. To solve the problem, rapid hardening cement is used for stitching concrete so as to shorten time of setting of concrete. Moreover, stitching work is designed to be carried out at nights of least traffic such on Saturday night and existing bridge may even be closed for numerous hours for example 6 hours to let stitching works to left undisturbed.

Occasionally, longitudinal joints are used in connecting new bridge parts to existing bridges. The key problem associated with the design is safety concern of vehicles. Change of frictional coefficients of bridge deck and longitudinal joints while vehicles change traffic lanes is incredibly dangerous to vehicles. Moreover, protection of longitudinal joints in bridges is fairly difficult.