Final answer:
The statement is True; turn signal indicators are legally required on vehicles manufactured after a certain model year, enhancing safety by signaling intent to turn or change lanes.
Step-by-step explanation:
The statement that 'turn signal indicators are required on all motor vehicles manufactured after model year' is True. Turn signal indicators, also known as turn signals, are crucial safety features on vehicles that communicate a driver's intent to make a turn or lane change to other road users. Since the early part of the 20th century, regulations have mandated the use of turn signals on vehicles. The inclusion of turn signals contributes to road safety by reducing confusion and uncertainty about a vehicle's intended maneuvers, which is particularly important at intersections where many vehicles speed through without regard to the posted speed limit. The use of a traffic signal, which often includes separate signals for turning, can similarly reduce speeds and improve safety by controlling the flow of traffic and reducing the chances of collisions.