I get it.
You're an engineer. A road-building expert.
You know a lot more than the umpteen expert panels that have studied this issue for the last 40 years.
And so we should just trust you when you say "use existing roads" despite all the evidence that the upgrade would cost more and yield poor results.
The UPGRADE would cost more than building a new terrain road and stealing property from towns and landowers who are going to fight this thing for years to come? That's a real scream.