What is the proper color for front turn signals on a truck?

The proper color for front turn signals on a truck is amber or white. This color scheme is standardized for vehicles to ensure clear communication of the driver's intentions to other road users. Amber light is specifically utilized for turn signals because it is easily recognizable and universally understood as a signal for turning or lane changes. The use of white is also acceptable in certain contexts, typically for vehicles designed with specific lighting configurations.

Red is reserved for brake lights, which indicate that a vehicle is slowing down or stopping, while blue lights are often used for emergency vehicles, and green is not a standard color for vehicle signaling. Therefore, the correct answer reflects both safety regulations and the conventions of vehicle lighting design.