What is the expected blocking angle when blocking an accident scene on the roadway?

The correct answer involves the right hand block, which is commonly used when responding to an accident scene on the roadway. The primary purpose of this method is to ensure the safety of both the responders and the individuals involved in the incident, as well as to effectively manage traffic.

A right hand block typically positions emergency vehicles in such a way that they do not obstruct the flow of traffic while still providing enough protection for responders working on the scene. This positioning allows for better visibility and access to the scene for emergency personnel and equipment, while also creating a physical barrier between moving traffic and the area where responders are operating.

In contrast to the other options, the left hand block may not provide the same level of safety and visibility for approaching vehicles, and a perpendicular block can obstruct traffic flow significantly. Additionally, completely avoiding blocking the roadway may not always be feasible or safe, depending on the circumstances of the accident. Thus, utilizing a right hand block is the most effective method for managing an accident scene safely and efficiently.