Final answer:
The absence of external controls on residential streets can lead to reckless behavior by drivers, increasing the risk of accidents and unsafe conditions.
Step-by-step explanation:
Fewer external controls on residential streets mean that drivers have fewer restrictions on their behavior. Without external controls such as traffic signals or speed limits, drivers may feel more inclined to drive at higher speeds, make abrupt turns, or ignore other traffic rules. This can lead to increased risk and danger for both drivers and pedestrians.
For example, without a traffic signal, drivers may speed through an intersection without adhering to the posted speed limit. Similarly, without speed limits, drivers may drive at unsafe speeds, endangering themselves and others.
Overall, the absence of external controls on residential streets can result in drivers behaving in a more reckless manner, potentially leading to accidents and unsafe conditions.