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"and the speed of the driver will be the same on all roads and can never be negative and the amount of the fine will be accumulated example 95km/h."
This is hardly understandable. Please make an effort on writing correct sentences.
This comment is hidden because it contains spoiler information about the solution
The description should clarify that a speed of 30 or more Kph above the speed limit results in the addition of a $500 fine. As it reads now it indicates that a speed in excess of 30 Kph above the speed limit (but not at 30) results in the added fine. If you follow the instructions as they are right now your tests will fail.