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It is illegal to drive faster than the stated miles per hour limit on any road; at the same time, driving too slowly can also result in problems. Don’t keep your speed down to 40mph on a dual carriageway where the speed limit might be 60, as you can hold up other drivers and this can cause accidents. Speedometers are not always accurate, so it is best to adjust your speed a little to allow for that. If, for example you are driving in a zone that has a 40 miles per hour limit, then you should aim for something between 35 and 40 miles.
