Vehicle Crash Investigation Assessment

What is the primary purpose of measuring skid marks at a crash scene?

• To determine the type of vehicle involved
• To calculate the initial speed of the vehicle
• To identify the driver's identity
• To measure the road width

The coefficient of friction for a dry concrete road surface typically ranges between:

• \(0.1\) to \(0.2\)
• \(0.3\) to \(0.4\)
• \(0.5\) to \(0.7\)
• \(0.8\) to \(1.0\)

Using the formula \(v = \sqrt{2gfd}\), where v is velocity, g is gravity (\(32.2 ft/s^2\)), f is friction coefficient, and d is skid distance, what was the initial speed of a vehicle that left a \(100\) foot skid mark on dry concrete (f = \(0.8\))?

• \(45\) mph
• \(55\) mph
• \(65\) mph
• \(75\) mph

When investigating a crash that occurred during rainy conditions, which factor would most significantly affect the friction coefficient?

• Vehicle color
• Road material
• Tire pressure
• Vehicle weight

In a collision where two vehicles meet at an angle, what is the primary method used to determine the impact angle?

• Measuring tire pressure
• Analyzing debris scatter pattern
• Checking vehicle registration
• Counting witnesses

The coefficient of friction for an icy road surface is typically:

• \(0.5\) to \(0.7\)
• \(0.3\) to \(0.4\)
• \(0.1\) to \(0.2\)
• \(0.8\) to \(1.0\)

What does a curved skid mark typically indicate?

• Brake failure
• Vehicle rotation during skidding
• Flat tire
• Normal straight-line braking

In crash investigation, what is the significance of calculating momentum?

• To determine vehicle color
• To establish collision speed
• To check tire pressure
• To measure road width

Which weather condition would create the highest coefficient of friction?

• Heavy rain
• Light snow
• Dry conditions
• Dense fog

When measuring skid marks, what is the most accurate method?

• Measuring from the middle of the mark
• Measuring the shortest distance
• Measuring from the beginning to end of the mark
• Measuring the widest point