According to the Illinois Vehicle Code (IVC), what must motorcycles have?

Motorcycles, according to the Illinois Vehicle Code, are required to have a headlight. The headlight is crucial for visibility, allowing other road users to see the motorcycle and for the operator to see the road ahead, especially during low light conditions or inclement weather. The regulation ensures that all motorcycles are equipped with functioning headlights to enhance safety on the road, which is vital for preventing accidents.

The presence or absence of side mirrors, a windscreen, or turn signals does not negate the requirement for a headlight, but these features may be regulated under other sections for motorcycle operation. However, it is the headlight that is specifically mandated by the Illinois Vehicle Code for legal operation of a motorcycle, making it the correct answer in this context.