Depends on the road and the conditions. By law you are required to follow the speed limit, I know in some areas the speed limit drops at night.
drive faster than the posted/maximum speed limit
60
80%
When weather and road conditions permit it.
Posted speed limits tell you what the maximum speed is on that specific road. That is the speed that you are legally able to drive on the road.
The normal speed limit on the highway.
You always adjust your speed to road conditions. Or you maintain the maximum speed for a short time and then get buried ;).
No, you should not. Your speed should depend on the weather conditions, and you should only drive a speed that is safe according to current visibility and road conditions.
disk rotational speed in RPM
65 mph
Police officers are typically allowed to drive up to the speed limit when responding to emergencies or pursuing suspects.
No. The posted speed limit of 55 miles an hour means you can drive a maximum of 55 miles an hour when it is safe to drive at that speed. Only an idiot would drive at that speed in fog and high wind.