The exception for speeding through a town where you are not familiar with the speed limits can vary depending on the jurisdiction and local laws. In general, not being familiar with the speed limits is not considered a valid excuse for exceeding the speed limit. It is the responsibility of the driver to be aware of and adhere to the posted speed limits in the area they are driving.
If you are driving through an unfamiliar town, it is important to exercise caution and pay attention to road signs indicating speed limits. In some cases, there may be additional signs or warnings indicating reduced speed limits in certain areas, such as school zones or construction zones. It is always advisable to drive at a safe and reasonable speed, taking into consideration the conditions of the road, traffic, and any potential hazards.
If you are unsure about the speed limits in a particular area, it is best to err on the side of caution and drive at a speed that is considered safe under normal conditions. Obeying traffic laws and regulations is crucial for the safety of yourself and others on the road.