Primary contact is the first contact between two collision vehicles, or the location in which a single vehicle struck a fixed object, or an overturning vehicle struck the roadway.

Primary contact is the first contact between two collision vehicles, or the location in which a single vehicle struck a fixed object, or an overturning vehicle struck the roadway.

• A. The second contact
• B. The first contact between two collision vehicles, or the location in which a single vehicle struck a fixed object, or an overturning vehicle struck the roadway
• C. The last contact after disengagement
• D. The point of impact

Answer: (B)

The key idea here is what “primary contact” means in crash analysis: it is the first contact that starts the crash sequence. In a collision between two vehicles, it’s the initial impact between them. If a single vehicle hits a fixed object, it’s the spot where that first impact occurs. If a vehicle overturns and then strikes the roadway, the primary contact is where the vehicle first touched the road. This definition matches the description given as the correct answer. Other options describe later moments or different terms that don’t capture the initiating contact: the second or last contact refers to subsequent impacts, and the term “point of impact” can be ambiguous and not necessarily the initiating contact in every scenario.

The key idea here is what “primary contact” means in crash analysis: it is the first contact that starts the crash sequence. In a collision between two vehicles, it’s the initial impact between them. If a single vehicle hits a fixed object, it’s the spot where that first impact occurs. If a vehicle overturns and then strikes the roadway, the primary contact is where the vehicle first touched the road. This definition matches the description given as the correct answer.

Other options describe later moments or different terms that don’t capture the initiating contact: the second or last contact refers to subsequent impacts, and the term “point of impact” can be ambiguous and not necessarily the initiating contact in every scenario.