06-27-2021, 10:27 PM
(06-27-2021, 08:42 PM)danbrotherston Wrote: The proposed causeway is enormous, almost 1/4 of a km long. Leaving aside the expense, such a long distance takes away the opportunity to make recreation space in the green area, as well as a direct connection to Dutton Dr.
A bridge must be significantly higher because double large trucks use the highway, where as even a high airy human sized tunnel would be significantly smaller.
Whatever technique the bridge uses to reach ground level towards Northfield Station, it or a branch of the bridge can do the same to reach towards Dutton Drive. And I don’t see what the presence of the bridge has to do with use of the space for most recreational purposes — just run a ground-level path over from where the bridge starts.
The height of the bridge above the road won’t make much difference. It’s just a matter of how long the posts have to be — maybe 5m. One 50m up or something would be way more expensive of course. Digging for a tunnel is always going to be very expensive, especially given how wide it would have to be to make people comfortable. The floor of a tunnel would have to be at least maybe 3m below grade (guess) so getting back up to the surface would be a significant distance unless the ground slopes downwards away from the expressway.