**3D and 4D Models Used in Bridge Design and Education**

This chapter discusses 3D and 4D model analysis used in bridge design. The aesthetic analy‐ sis is an important issue that must be considered when designing a new bridge, especially when it is to be built in an urban area. In this context, the automatic generation of three-di‐ mensional (3D) geometric models of the bridge under analysis, and the walk-around and aerial simulation allowed over it, may help bridge designers to evaluate its aesthetic concept and environmental impact. The bridge construction process can also be simulated, helping designers and builders to review the progress of the construction work in situ. The simula‐ tion of the construction activity made possible by the developed interactive 4D model helps bridge designers to analyse the whole construction process.
