Final answer:
Flora's situation is likely an example of the bystander effect, where the presence of others reduces the likelihood that any single individual will stop and offer help due to diffusion of responsibility and social influence.
Step-by-step explanation:
The fact that other drivers fail to help Flora is most likely explained by a social-psychological phenomenon known as the bystander effect. This concept suggests that individuals are less likely to offer help to a victim when other people are present. The greater the number of bystanders, the less responsibility any single individual feels to take action. This can be linked to human behaviors such as diffusion of responsibility, where each bystander thinks that someone else will help, or social influence, where individuals monitor the behavior of those around them to determine if an action is necessary.
In the context of rush hour traffic, each driver might assume that someone else will stop to offer assistance or that professional help is already on the way. Unlike the stories described, where individuals show empathy and act to help others, Flora's situation highlights when the presence of others can inhibit this instinct to assist, especially in crowded or busy environments.