Exterior lighting devices and reflectors are dirty✓Правильный ответ
External lighting fixtures of other make of vehicles are installed on the vehicles which are out of production
In both cases.
Объяснение
Dirty lamps or reflectors cannot provide reliable visibility and signalling, so that condition prohibits operation. For a discontinued vehicle, compatible lighting units from another make may be used under the stated exception, so their presence alone is not a second violation.