Final answer:
You should always follow the speed limit for safety and legal reasons, despite the common behavior on the road. Speed limits are set for public safety, and exceeding them can result in traffic tickets and increased danger.
Step-by-step explanation:
Assuming that the common speed on the expressway is above the posted speed limit, you should still adhere to the traffic laws and drive at or below the legal speed limit. It is important to recognize that speed limits are set for the safety of all road users, and exceeding them can lead to dangerous situations and legal consequences. Not only is it a matter of law, but also a matter of public safety. While there might be a small amount of tolerance for going slightly over the speed limit, as most speedometers can have minor inaccuracies, significantly exceeding the limit increases the risk of receiving a traffic ticket. In addition, when considering whether to cross the road outside of a pedestrian crossing, it is safest to wait for a gap in traffic that allows enough time to cross the road safely, taking into account the speed of oncoming vehicles.