Which of the following is NOT required for vehicles built before January 1, 1969?

For vehicles built before January 1, 1969, turn signals are not a required feature. This is because regulations for automotive lighting and safety features have evolved over time. In older vehicles, the use of hand signals was a common practice for indicating turns or lane changes. As automotive technology advanced, the laws began to mandate specific lighting features for improved visibility and safety, including the installation of turn signals.

By contrast, backup lamps, side marker lamps, and brake lights have established requirements even for older vehicles. Backup lamps are crucial for safety when reversing, side marker lamps enhance visibility from the side, and brake lights are vital for signaling stopping intentions to drivers behind. These lighting elements were more universally recognized as essential for overall vehicle safety, which is why they are required regardless of a vehicle's production date.