What should a driver do if there are no posted speed limits in a residential area?

Answer: C — Drive at 30 mph by default

In residential areas where there are no posted speed limits, the generally accepted default speed limit is 30 mph. This standard is in place to promote safety for residents, pedestrians, and children who may be present. Driving at 30 mph strikes a balance between allowing efficient vehicle operation and ensuring safety in more densely populated zones. While options indicating other speeds may seem reasonable, they don't align with this established default limit. A speed of 25 mph could be considered safer but is not the default unless specifically posted, and higher speeds like 35 mph could increase the risk of accidents in an area where children and families are more likely to be present. Thus, keeping the default speed limit of 30 mph ensures that drivers maintain a safe and cautious approach when navigating through residential settings, aligning with traffic laws and promoting public safety.