AASHTO BAS-1, Bridge Aesthetics Sourcebook: Practical Ideas for Short- and Medium-Span Bridges (November 2010), collects practical ideas for improving the appearance of short- and medium-span bridges. An opening chapter addresses why aesthetics should be considered in bridge design, and a companion chapter explains how to consider aesthetics. Design guideline chapters present ideas for improving how visible bridge elements look within their communities. The premise is that every structural decision affecting the size, shape, color, or surface texture of a visible part of a bridge is also an aesthetic decision that affects how people feel about the bridge. Background chapters supply supporting information for the design guidance. The sourcebook closes with example bridges and a bibliography, and bridge engineers can use it when making everyday design decisions on visible bridge elements.