Final answer:
The safest speed in heavy traffic is the speed of the traffic, if it is legal and safe—. One should avoid speeding and also driving too slow, adjusting to the de facto traffic flow while adhering to the de jure speed limit. The correct answer is option A.
Step-by-step explanation:
When driving in heavy traffic, the safest speed to maintain is option (A) the speed of the traffic (if not illegal or unsafe). It is crucial to adjust your speed to the flow of traffic as long as it is within the legal limits and safe for the current road conditions. Driving too fast or too slow can both present risks. Speeding might lead to less reaction time in case an unexpected situation arises, while driving significantly slower can cause traffic delays and potential accidents from abrupt stops or from other drivers trying to navigate around a slow vehicle.
The posted speed limit is a de jure speed determined by traffic authorities and is set considering the ideal conditions of the road. However, the de facto speed, which is the speed at which traffic generally flows, may differ. This does not mean it is acceptable to exceed the speed limit; traffic officers can issue fines if you are caught speeding.
In summary, while driving, it is also important to remain alert, to avoid distractions like honking unnecessarily or engaging in aggressive driving behaviors like tailgating, as illustrated in the supplied example with Peter and the elderly driver. Always ensure the safety of all road users, including pedestrians, and be mindful of the conditions that might dictate a necessary speed adjustment, like a traffic officer present or a sudden change in traffic signals.