Hello, dear, the speed limit of some roads in Tianchang city is 40. If the speed limit is below 60 km/h, the speed limit will not exceed 50% and no penalty will be imposed. So speeding on the road with a speed limit of 40 is not penalized. This is to alleviate the congestion caused by the speed limit, allow proper speeding in certain periods, and relieve the road traffic pressure.