There’s one around the White Mountains in NH that I have driven on that was 75 mph, but that is the absolute fastest I have ever seen. The same highway (I think) stayed 75 mph through the Green Mountains in VT too. Both areas are rural without a ton of drivers outside of peak tourism season, and about a 0% chance of hitting a pedestrian.
Definitely a chance of hitting a moose and totally fucking up it’s legs, ending your own life in the process. Motherfuckers have been known to walk away from many car accidents without much more than a limp. They’re tall enough where they roll over most cars and even many pickup trucks when full grown.
EDIT: Nevermind. It was I-93, which has a speed of 70 mph in the section that I drove on and I couldn’t find a 70 mph speed limit sign on that highway in VT, because it ends quickly after entering VT. Couldn’t be bothered to find where the VT highway was though.