All motor vehicles manufactured after the year ____________ must be equipped with electrical turn signal lights.

Vehicles manufactured after 1959 are required to be equipped with electrical turn signal lights, as mandated by vehicle safety regulations. This change was significant because it enhanced the visibility of a driver's intentions when changing lanes or turning, thereby improving safety on the road. The introduction of turn signals marked a major shift in vehicular design towards prioritizing communication with other drivers, reducing the likelihood of accidents that were prevalent when drivers relied solely on hand signals.

Prior to 1959, many vehicles did not have this feature, which could lead to misunderstandings or lack of awareness among drivers regarding others' maneuvers. Since then, the standardization of electrical turn signals has become integral in automotive design, ensuring that vehicles are equipped with essential safety features to facilitate clearer communication of driver intent.