Final answer:
The question involves legal and safe responses to scenarios where a vehicle is obstructing traffic, including stopping for emergency vehicles and the implications of installing traffic signals to improve safety. Pedestrian safety and the role of traffic signals in reducing accidents are highlighted in the context.
Step-by-step explanation:
The question deals with scenarios where a vehicle is obstructing traffic and how to respond in different situations. When a car is blocking traffic without injuries, best practices would dictate that drivers should safely move the vehicle out of the way if possible to alleviate congestion. However, scenarios can vary, such as when emergency vehicles approach or when there are specific urgent circumstances like a woman in labor at a red light.
For example, when an ambulance is encountered, the correct action is to stop moving and become stationary until it passes by, ensuring that traffic is not further hindered and emergency services can proceed unobstructed. It's not advisable to run toward or alongside an ambulance as these actions are unsafe and illegal.
Furthermore, the discussion about the installation of a traffic signal at a busy intersection highlights the balance between pedestrian safety and vehicle flow. The cause-and-effect paragraph demonstrates the necessity of a traffic signal by citing increased vehicle speeds, pedestrian safety challenges, and the unfortunate occurrence of accidents, which can be mitigated by the proper control of traffic.