Final answer:
To make safe and legal turns on city streets and highways, you must signal at least 100 feet before the turn. Signaling in advance is crucial for ensuring the safety of all road users by providing clear communication of driving intentions.
Step-by-step explanation:
To make safe and legal turns on city streets and open highways, you must signal your turn at least. This question pertains to rules of the road and driving etiquette, which fall under the category of Health and Safety education, often covered in high school driver's education courses. On the matter of signaling, laws can vary by jurisdiction, but the widely accepted rule is to signal at least 100 feet before making your turn in city streets, and this distance can be greater on open highways where speeds are faster. Safety needs to alert other drivers and pedestrians of your intent to turn. Incorporating a real-world example: when a traffic signal is installed at a problematic intersection, such as the one where before installation vehicles disregarded the posted speed limit and accidents occurred frequently, we can observe an improvement in traffic flow and pedestrian safety. Indicators and traffic signals together make for an organized and safe driving environment. As for the moral debate of breaking traffic laws under exceptional circumstances, such as to assist a person in dire need of medical attention, this lies in the philosophical realm and isn't a legal justification.