sentences:  A number of not directly motorway-related projects will form part of the SH20 connection works, either to mitigate negative effects on the environment, or to provide for other transport modes.Enabling works and allowance for the Avondale–Southdown Line are a part of constructing SH20.KiwiRail sees this route as strategically important as it is the only real alternative for a cross-isthmus heavy rail route, as upgrading of the existing Newmarket Line is not realistically feasible or possible.