What is line "D" pointing to? 
Definitions:
Skid Marks
Visible marks left on a surface where friction from wheels or shoes has occurred; often associated with braking or slipping.
Efficiency
The ratio of the useful output of a system to the input, expressed in percentage form, indicating the effectiveness with which it converts energy or material into desirable outputs.
Property Damage Liability
A component of auto insurance that covers damage you, as the driver, might cause to another person's property.
Underinsured Driver
A motorist who has insurance coverage, but not enough to cover the full costs of a claim from an accident.
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