Methods and technologies for evaluating and minimising noise from road bridge expansion joints

Noise generated by traffic crossing road bridges can be a major source of disturbance for local communities and must be carefully considered in planning bridge construction and maintenance projects – especially when specifying expansion joint solutions, since expansion joints are typically mechanical components that introduce discontinuities or unevenness into an otherwise smooth driving surface. The consequences of not adequately considering the potential impact of noise on a community can be substantial, with public relations difficulties and high adaptation or replacement costs. This paper explores the subject of noise associated with bridge expansion joints, including an assessment of what types of joint may be considered quiet, and how noisier types – such as modular or single-gap joints – may be made quieter. Approaches to evaluating noise and what should be considered are discussed, with reference to findings from illustrative noise measurement studies.

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