ABSTRACT
Towers are the most visible structural elements of long-span bridges, because they project above the superstructure and can be seen from all directions by both viewers and bridge users. Towers give to a bridge a characteristic identity, a unifying theme, a motif from which people can identify that particular bridge. Towers project a mnemonic bridge image that people can recall as their lasting impression of that bridge itself, making towers an important part of the overall esthetics.
