At what point to you adjust your speed when you see a change in speed limit sign?

Answer As you cross the sign you should be at the posted speed limit. Most of the time there is a pre-speed reduction sign a few hundred yards ahead if the actual speed lot sign. Just

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Why have speed cameras on roads that look like you should be going faster than what the speed limit is?

Speed cameras I don't mind, but what I really hate is seeing some copper on the side of the pavement with a ray gun (let's call them ray guns) trying to get people in the morning rush-hour traffic.... Read More »

Can a cop detect you with a speed gun if Ur on a motorbike if Ur going over speed limit?

Yes thye can. But see Motor Cycle News website for how to get off the charge - hand-held laser guns have not been tested on motorcycles, so the evidence is not valid in law.

What is the national speed limit for a car on a UK motorway?

The national speed limit for cars and motorcycles on motorways in the UK is 70 miles per hour (112 km per hour), unless there are signs that indicate otherwise. This speed limit also applies to car... Read More »

If there is a school what is the speed limit?

Ther sign being present almost certainly makes it a school zone, which is (in typical California traffic law fashion) "25 mph or under" (first source) depending on the community.