Here’s a small mapping website we worked on recently showing where the proposed tunnel between the M1 and the M2 motorways in Sydney is planned to go.. I’ve gotta warn, the bright green colour scheme is pretty loud.. not my choice.
http://gisapps.aecomgis.com/northconnex/map.html
The website uses the esri JavaScript API and some nice dojo features like the dojo tooltip to show the depth of the tunnel on mouse over.

northconnex