What is prohibited to display on a vehicle's front other than white or amber lights?

The prohibition of displaying lights other than white or amber on a vehicle’s front specifically aims to reduce confusion and enhance safety on the road. In Indiana, as in many states, using colors like red or green on the front of a vehicle can mislead other drivers regarding the vehicle’s status or intent.

Red lights are typically reserved for emergency vehicles, which is why they are not permitted on personal or non-emergency vehicles. Similarly, green lights might suggest specific meanings related to areas such as volunteer emergency responders, which could also lead to confusion if they appear on non-emergency vehicles.

Since both red and green lights are restricted from being displayed on the front of a vehicle, this aligns with the overall goal of maintaining clear communication on the roads, which is crucial for safety. Thus, the correct answer reflects the understanding that displaying either color could significantly impair the ability of other drivers to interpret safe driving behaviors correctly.