Final answer:
Among road users, pedestrians and cyclists are the most vulnerable due to a lack of protective structure and their high risk of sustaining injuries in traffic accidents.
Step-by-step explanation:
The most vulnerable road users are typically pedestrians and cyclists. The statistics on driver dummies suggest a risk of head injuries in the event of traffic accidents. Personal accounts, like the one of the individuals hit by a car while riding a bicycle to their job at the hospital, underscore the dangers faced by cyclists in particular.
While surveillance technologies can track pedestrians and cyclists, that does not mitigate the risk of accidents. Factors such as visibility, protection during impact, and the speed differential between them and motor vehicles contribute to their vulnerability.
Pedestrians and cyclists are at an inherent disadvantage because they lack the protective structure around them that is typical of motor vehicles. The likelihood of sustaining serious injuries in an accident is significantly higher for them. This is evidenced not only by statistical data but also by the real-world experiences of people who have been involved in roadside accidents.