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 speed limit is enforced when it is in sight of a person
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.
Any type of measurement is a unit rate. The speed limit is a measurement of time and distance.
That depends on how much the speed limit is.
The increased speed limit goes into effect AT the speed limit sign, not at any point before that. While you're not likely to get cited for accelerating at a reasonable point before you actually get to the sign, you're still bound by the prior speed limit until you actually reach that sign.
You can calculate a speed by dividing a distance by the time it takes to cover that distance. If you want the instantaneous speed (for situations of variable speed), you need to calculate the distance and time for a fairly short time interval (ideally, the limit, when the time approaches zero).
You can go to traffic school if it is your first offence. After that, you will have to pay a fine.
20km over the speed limit will incurr immediate loss of license
Fasten that safety belt before moving the vehicle; look both ways before pulling out from a stop; obey speed limit signs ... "speed limit" is not the speed you HAVE to go, rather the highest speed allowed for that road in that area.
Basically, an advisory speed limit sign is posted when there is an area of roadway where a hazard could occur. Example; a highway has a speed limit of 45mph. A curve that has a bridge directly on the other side may have a spped limit advisory of 35 mph. This limit is not, as some beleive, the maximum safe limit, but is the speed which gives the driver greatest chance of avoiding a problem if one occured with minimal impact on the traffic flow. These signs are not enforced as a speed limit sign, however, any time a driver is going too fast for conditions is illegal, regardless of what the speed limit sign or advisory exhibits.
It takes 2h and 42 Minutes driving at the speed limit.
10 mphAdded: Statutory speed limits, enforceable by the police, apply ONLY on public ROADS, STRREETS, and HIGHWAYS. If there are speed signs posted on the parking lot they are 'advisory' only, or are enforced by school personnel.