Virtually all development projects have noise impacts. Noise during construction may be due to such activities as land clearance, piling, and the transport of materials to and from the site. During operation noise levels may decrease for some forms of developments such as science parks or new towns, but may remain high or even increase for developments such as new roads or industrial processes. Demolition is a further cause of noise. As a result, despite the fact that Directives 85/337 and 97/11 (§1.4) do not require noise to be analysed, the EIAs for most projects do consider noise.