A slow speed limit cannot be enforced on a private road in the state of Virginia. You can put a sign up but is will not be enforced by the state.
65 miles per hour is the max speed limit.
Depends on who administers the road. If it's a private road, the speed limit will be whatever the owner of the road determines it to be. In most instances of gravel roads not being private roads, they'll typically be county roads, and the county will have the jurisdiction to determine the speed limit.
The slowest I've ever seen was 5 MPH, but this was on private property.
I'm not sure what you meen by this. Any limit set by bt will be for your internet connection (be it speed or download limit, although I'm guessing you meant speed). Stuff you do on the private network has nothing to do with the internet, so the speed will depend only on the router (normaly around 100mb/s). Please make this question clearer, give a bit more information.
826 limit
the posted speed limit
When another speed limit sign is reached that changes the limit from the previously posted one.
The speed limit is exactly that - the speed limit. While a reasonable excess of speed might be overlooked when overtaking another vehicle, there is no guarantee. You can be pulled over and cited for speeding, still.
The posted speed limit is the max speed.
In the UK the speed limit comes into force as soon as you pass the speed limit sign. As such the distance is zero as you should have slowed down to the posted speed limit before passing the sign.
The humps do not affect the speed limit. The speed limit is determined by other rules and signs.
The speed limit is 55mph.