What height requirement do stop lamps have for car regulations?

The correct answer highlights that the height requirement for stop lamps in car regulations is between 12 to 24 inches from the ground. This specification is important as it ensures that the stop lamps are positioned at a height that is visible to drivers and other road users, thus improving safety on the roads. A lower height allows the lights to be effectively seen by vehicles of different sizes, including SUVs and trucks, which might have higher body elevations compared to small cars.

The other options suggest height ranges that either exceed or fall below typical standards established for vehicle safety and visibility. For instance, the range of 20 to 30 inches might be too high to effectively convey a stop signal to drivers of smaller vehicles, while the suggestion of heights above 300 feet is impractical and irrelevant in the context of vehicle regulations, as it would place the lamps far out of the typical line of sight.