The construction and operation of the HSL will impact the environment considerably. It is stipulated by law that all environmental effects must be brought into view before the minister can make the Route Decision definitive. For this reason, the HSL Project Organization composed an extensive Environmental Impact Report, with predictions about the expected effects for the environment.
These expectations then must be verified. This is done by conducting a (statutory) assessment of the Environmental Impact Report, which compares the environmental effects that actually occur with the environmental consequences as predicted in the report.
In effect, the assessment of the Environmental Impact Report serves two purposes:
An assessment report will be made for the HSL after one year of its operation, and again after ten years.