Yes, Test Track at EPCOT in Walt Disney World features a very well-utilized Single Rider line, which is often one of the most efficient ways to experience this popular attraction. Because the ride vehicles seat six people in two rows of three, the "Single Rider" line is used by Cast Members to fill the empty middle seats that occur when groups of two or four board. Using this line can often reduce your wait time by 50% or more compared to the standard standby queue. However, there is a significant trade-off: Single Riders bypass the full "Design Studio" experience. Instead of using the large touchscreens to meticulously customize your virtual concept vehicle, you are usually directed to a smaller, "quick-select" kiosk where you choose from pre-designed templates. Furthermore, your group will be separated, and you will be seated with strangers. If your primary goal is to experience the high-speed outdoor loop and the "Power, Capability, and Efficiency" tests without a long wait, the Single Rider line is an excellent choice, but those wanting the full creative experience should stick to the standby or Lightning Lane.