Drivers intending to stay on the highway/freeway should stay in the right lane or the lane designated as a through-lane. The only times you should move left is to allow vehicles to merge from a right side on ramp (and move back to the right lane as soon as you can), or to pass slower traffic already in the right lane (then move back to the right lane when it is safe to do so). If a freeway provides a "slower" lane and you drive slower than the maximum speed allowed, you should use the slower lane. But never hog the passing lane just to keep driving in it; move over and let faster traffic pass you.
They are as high as 65. In North Dakota, the speed limit is 65 mph on two-lane highways if posted for that speed.
In the UK the 'National' speed limit is 60 mph unless the road is restricted in which case the speed limit will be displayed on road signs, these are normally 50 mph, 40 mph, 30 mph or even 20 mph. Motorways and Dual Carriageways have a 'National' speed limit of 70 mph unless otherwise stated. Of course other countries will set there own speed limits which may differ from those of the UK.
Whatever the posted speed limit is.
The left most lane
If they are doing the speed limit, there should be no reason to pass them. If you are exceeding the speed limit to pass someone, you could get a ticket particularly if they are exceeding the speed limit.
it is like 50mph or 51
If you are referring to a freeway division (as in on the road), the answer is "lane." (:
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Not looking in blind spotAdded: Not matching your merging speed to the speed of the traffic already on the road.
accelerate above the speed limit
On a freeway/highway, the lane which contains the diamond like shape is a separate travel lane. Specifically this lane is dedicated to the "ride share" and/or individuals carpooling.