Moped is a small motorcycle with less stringent licensing requirements than full motorcycles. Term coined by Swedish journalist Harald Nielsen in 1952 as "motor and pedaler". Early mopeds had bicycle pedals and helper motors on various locations
Black ice is a transparent coating of glaze ice on surfaces. Forms when light rain falls on roads below freezing temperature. Can occur when road surface is slick from rain and temperatures drop
State police are unique to each U.S. state with nationwide law enforcement authority. Twenty-three states use the term "State Police," forty-nine have dedicated agencies. Hawaii is the only state without a dedicated statewide police force
Traffic barriers protect vehicles from obstacles and prevent collisions. Used in medians to prevent vehicles from entering opposing carriageways. Can protect vulnerable areas like school yards and fuel tanks
Turning radius defines minimum space needed for semi-circular U-turn without skidding. Turning diameter measures minimum space needed for maximum steering displacement. Turning radius is half of turning diameter. Two measurement methods: wall-to-wall and curb-to-curb
ESC improves vehicle stability by detecting and reducing traction loss. Automatically applies brakes to wheels to counter oversteer or understeer. Reduces engine power until control is regained. Does not improve cornering performance but helps prevent control loss